deps: remove clamp on virtualenv

Upstream issue with pip 21.1.1 was resolved in 21.1.2. This version of
pip was embedded in virtualenv versions 20.4.7 and above.

Relates-to: python-poetry#4042

poetry.lock

 [[package]]
-name = "appdirs"
-version = "1.4.4"
-description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
-category = "main"
-optional = false
-python-versions = "*"
-
-[[package]]
 name = "atomicwrites"
 version = "1.4.0"
 description = "Atomic file writes."
@@ -29,6 +21,21 @@ tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)"
 tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins"]
 
 [[package]]
+name = "backports.entry-points-selectable"
+version = "1.1.0"
+description = "Compatibility shim providing selectable entry points for older implementations"
+category = "main"
+optional = false
+python-versions = ">=2.7"
+
+[package.dependencies]
+importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
+
+[package.extras]
+docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
+testing = ["pytest (>=4.6)", "pytest-flake8", "pytest-cov", "pytest-black (>=0.3.7)", "pytest-mypy", "pytest-checkdocs (>=2.4)", "pytest-enabler (>=1.0.1)"]
+
+[[package]]
 name = "cachecontrol"
 version = "0.12.6"
 description = "httplib2 caching for requests"
@@ -383,6 +390,18 @@ python-versions = "*"
 testing = ["nose", "coverage"]
 
 [[package]]
+name = "platformdirs"
+version = "2.4.0"
+description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
+category = "main"
+optional = false
+python-versions = ">=3.6"
+
+[package.extras]
+docs = ["Sphinx (>=4)", "furo (>=2021.7.5b38)", "proselint (>=0.10.2)", "sphinx-autodoc-typehints (>=1.12)"]
+test = ["appdirs (==1.4.4)", "pytest (>=6)", "pytest-cov (>=2.7)", "pytest-mock (>=3.6)"]
+
+[[package]]
 name = "pluggy"
 version = "1.0.0"
 description = "plugin and hook calling mechanisms for python"
@@ -667,23 +686,24 @@ socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
 
 [[package]]
 name = "virtualenv"
-version = "20.4.4"
+version = "20.8.1"
 description = "Virtual Python Environment builder"
 category = "main"
 optional = false
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
 
 [package.dependencies]
-appdirs = ">=1.4.3,<2"
+"backports.entry-points-selectable" = ">=1.0.4"
 distlib = ">=0.3.1,<1"
 filelock = ">=3.0.0,<4"
 importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 importlib-resources = {version = ">=1.0", markers = "python_version < \"3.7\""}
+platformdirs = ">=2,<3"
 six = ">=1.9.0,<2"
 
 [package.extras]
 docs = ["proselint (>=0.10.2)", "sphinx (>=3)", "sphinx-argparse (>=0.2.5)", "sphinx-rtd-theme (>=0.4.3)", "towncrier (>=19.9.0rc1)"]
-testing = ["coverage (>=4)", "coverage-enable-subprocess (>=1)", "flaky (>=3)", "pytest (>=4)", "pytest-env (>=0.6.2)", "pytest-freezegun (>=0.4.1)", "pytest-mock (>=2)", "pytest-randomly (>=1)", "pytest-timeout (>=1)", "packaging (>=20.0)", "xonsh (>=0.9.16)"]
+testing = ["coverage (>=4)", "coverage-enable-subprocess (>=1)", "flaky (>=3)", "pytest (>=4)", "pytest-env (>=0.6.2)", "pytest-freezegun (>=0.4.1)", "pytest-mock (>=2)", "pytest-randomly (>=1)", "pytest-timeout (>=1)", "packaging (>=20.0)"]
 
 [[package]]
 name = "webencodings"
@@ -708,13 +728,9 @@ testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytes
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.6"
-content-hash = "458035eaa19225869083c98c699e753de1844dd82030447634836e2f79255df1"
+content-hash = "15dc46f1a8bf5a3eb2a3c48f9a8527f89fac67487e8188e67c0a603c376fd0fd"
 
 [metadata.files]
-appdirs = [
-    {file = "appdirs-1.4.4-py2.py3-none-any.whl", hash = "sha256:a841dacd6b99318a741b166adb07e19ee71a274450e68237b4650ca1055ab128"},
-    {file = "appdirs-1.4.4.tar.gz", hash = "sha256:7d5d0167b2b1ba821647616af46a749d1c653740dd0d2415100fe26e27afdf41"},
-]
 atomicwrites = [
     {file = "atomicwrites-1.4.0-py2.py3-none-any.whl", hash = "sha256:6d1784dea7c0c8d4a5172b6c620f40b6e4cbfdf96d783691f2e1302a7b88e197"},
     {file = "atomicwrites-1.4.0.tar.gz", hash = "sha256:ae70396ad1a434f9c7046fd2dd196fc04b12f9e91ffb859164193be8b6168a7a"},
@@ -723,6 +739,10 @@ attrs = [
     {file = "attrs-21.2.0-py2.py3-none-any.whl", hash = "sha256:149e90d6d8ac20db7a955ad60cf0e6881a3f20d37096140088356da6c716b0b1"},
     {file = "attrs-21.2.0.tar.gz", hash = "sha256:ef6aaac3ca6cd92904cdd0d83f629a15f18053ec84e6432106f7a4d04ae4f5fb"},
 ]
+"backports.entry-points-selectable" = [
+    {file = "backports.entry_points_selectable-1.1.0-py2.py3-none-any.whl", hash = "sha256:a6d9a871cde5e15b4c4a53e3d43ba890cc6861ec1332c9c2428c92f977192acc"},
+    {file = "backports.entry_points_selectable-1.1.0.tar.gz", hash = "sha256:988468260ec1c196dab6ae1149260e2f5472c9110334e5d51adcb77867361f6a"},
+]
 cachecontrol = [
     {file = "CacheControl-0.12.6-py2.py3-none-any.whl", hash = "sha256:10d056fa27f8563a271b345207402a6dcce8efab7e5b377e270329c62471b10d"},
     {file = "CacheControl-0.12.6.tar.gz", hash = "sha256:be9aa45477a134aee56c8fac518627e1154df063e85f67d4f83ce0ccc23688e8"},
@@ -967,6 +987,10 @@ pkginfo = [
     {file = "pkginfo-1.7.1-py2.py3-none-any.whl", hash = "sha256:37ecd857b47e5f55949c41ed061eb51a0bee97a87c969219d144c0e023982779"},
     {file = "pkginfo-1.7.1.tar.gz", hash = "sha256:e7432f81d08adec7297633191bbf0bd47faf13cd8724c3a13250e51d542635bd"},
 ]
+platformdirs = [
+    {file = "platformdirs-2.4.0-py3-none-any.whl", hash = "sha256:8868bbe3c3c80d42f20156f22e7131d2fb321f5bc86a2a345375c6481a67021d"},
+    {file = "platformdirs-2.4.0.tar.gz", hash = "sha256:367a5e80b3d04d2428ffa76d33f124cf11e8fff2acdaa9b43d545f5c7d661ef2"},
+]
 pluggy = [
     {file = "pluggy-1.0.0-py2.py3-none-any.whl", hash = "sha256:74134bbf457f031a36d68416e1509f34bd5ccc019f0bcc952c7b909d06b37bd3"},
     {file = "pluggy-1.0.0.tar.gz", hash = "sha256:4224373bacce55f955a878bf9cfa763c1e360858e330072059e10bad68531159"},
@@ -1089,8 +1113,8 @@ urllib3 = [
     {file = "urllib3-1.26.7.tar.gz", hash = "sha256:4987c65554f7a2dbf30c18fd48778ef124af6fab771a377103da0585e2336ece"},
 ]
 virtualenv = [
-    {file = "virtualenv-20.4.4-py2.py3-none-any.whl", hash = "sha256:a935126db63128861987a7d5d30e23e8ec045a73840eeccb467c148514e29535"},
-    {file = "virtualenv-20.4.4.tar.gz", hash = "sha256:09c61377ef072f43568207dc8e46ddeac6bcdcaf288d49011bda0e7f4d38c4a2"},
+    {file = "virtualenv-20.8.1-py2.py3-none-any.whl", hash = "sha256:10062e34c204b5e4ec5f62e6ef2473f8ba76513a9a617e873f1f8fb4a519d300"},
+    {file = "virtualenv-20.8.1.tar.gz", hash = "sha256:bcc17f0b3a29670dd777d6f0755a4c04f28815395bca279cdcb213b97199a6b8"},
 ]
 webencodings = [
     {file = "webencodings-0.5.1-py2.py3-none-any.whl", hash = "sha256:a0af1213f3c2226497a97e2b3aa01a7e4bee4f403f95be16fc9acd2947514a78"},

pyproject.toml

@@ -44,8 +44,8 @@ shellingham = "^1.1"
 tomlkit = ">=0.7.0,<1.0.0"
 pexpect = "^4.7.0"
 packaging = "^20.4"
-# temporarily clamped due to https://github.com/pypa/pip/issues/9953
-virtualenv = ">=20.4.3,<20.4.5"
+# exclude 20.4.5 - 20.4.6 due to https://github.com/pypa/pip/issues/9953
+virtualenv = "(>=20.4.3,<20.4.5 || >=20.4.7)"
 keyring = ">=21.2.0"
 entrypoints = "^0.3"
 importlib-metadata = {version = "^1.6.0", python = "<3.8"}