chore: restrict virtualenv for Python 3.9 on Windows due to issues with the embedded pip

poetry.lock

@@ -1688,6 +1688,27 @@ socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
 
 
 [[package]]
 [[package]]
 name = "virtualenv"
 name = "virtualenv"
+version = "20.16.5"
+description = "Virtual Python Environment builder"
+category = "main"
+optional = false
+python-versions = ">=3.6"
+files = [
+    {file = "virtualenv-20.16.5-py3-none-any.whl", hash = "sha256:d07dfc5df5e4e0dbc92862350ad87a36ed505b978f6c39609dc489eadd5b0d27"},
+    {file = "virtualenv-20.16.5.tar.gz", hash = "sha256:227ea1b9994fdc5ea31977ba3383ef296d7472ea85be9d6732e42a91c04e80da"},
+]
+
+[package.dependencies]
+distlib = ">=0.3.5,<1"
+filelock = ">=3.4.1,<4"
+platformdirs = ">=2.4,<3"
+
+[package.extras]
+docs = ["proselint (>=0.13)", "sphinx (>=5.1.1)", "sphinx-argparse (>=0.3.1)", "sphinx-rtd-theme (>=1)", "towncrier (>=21.9)"]
+testing = ["coverage (>=6.2)", "coverage-enable-subprocess (>=1)", "flaky (>=3.7)", "packaging (>=21.3)", "pytest (>=7.0.1)", "pytest-env (>=0.6.2)", "pytest-freezegun (>=0.4.2)", "pytest-mock (>=3.6.1)", "pytest-randomly (>=3.10.3)", "pytest-timeout (>=2.1)"]
+
+[[package]]
+name = "virtualenv"
 version = "20.16.7"
 version = "20.16.7"
 description = "Virtual Python Environment builder"
 description = "Virtual Python Environment builder"
 category = "main"
 category = "main"
@@ -1807,4 +1828,4 @@ testing = ["flake8 (<5)", "func-timeout", "jaraco.functools", "jaraco.itertools"
 [metadata]
 [metadata]
 lock-version = "2.0"
 lock-version = "2.0"
 python-versions = "^3.7"
 python-versions = "^3.7"
-content-hash = "728bc093f740faad6db2b3a1c7a61ea05ca6c6a998b1f144f071cdea5a3b2771"
+content-hash = "67df799e05fb4afd82e52395a1f0d5caa51cc33232d4311e6b7a4c8991f946a9"

pyproject.toml

@@ -70,9 +70,14 @@ shellingham = "^1.5"
 tomli = { version = "^2.0.1", python = "<3.11" }
 tomli = { version = "^2.0.1", python = "<3.11" }
 # exclude 0.11.2 and 0.11.3 due to https://github.com/sdispater/tomlkit/issues/225
 # exclude 0.11.2 and 0.11.3 due to https://github.com/sdispater/tomlkit/issues/225
 tomlkit = ">=0.11.1,<1.0.0,!=0.11.2,!=0.11.3"
 tomlkit = ">=0.11.1,<1.0.0,!=0.11.2,!=0.11.3"
+# trove-classifiers uses calver, so version is unclamped
 trove-classifiers = ">=2022.5.19"
 trove-classifiers = ">=2022.5.19"
 # exclude 20.4.5 - 20.4.6 due to https://github.com/pypa/pip/issues/9953
 # exclude 20.4.5 - 20.4.6 due to https://github.com/pypa/pip/issues/9953
-virtualenv = "^20.4.3,!=20.4.5,!=20.4.6"
+virtualenv = [
+    { version = "^20.4.3,!=20.4.5,!=20.4.6", markers = "sys_platform != 'win32' or python_version != '3.9'" },
+    # see https://github.com/python-poetry/poetry/pull/6950 for details
+    { version = "^20.4.3,!=20.4.5,!=20.4.6,<20.16.6", markers = "sys_platform == 'win32' and python_version == '3.9'" },
+]
 xattr = { version = "^0.10.0", markers = "sys_platform == 'darwin'" }
 xattr = { version = "^0.10.0", markers = "sys_platform == 'darwin'" }
 urllib3 = "^1.26.0"
 urllib3 = "^1.26.0"