This ensures to use the correct python executable.
Using `run` simply uses `sys.prefix` with a bin suffix, which is not necessarily the currently used python executable.

E.g. when linking a specific python version to a custom directory, using `sys.prefix` may point to the wrong python version:
* /usr/bin/python2.7
* /usr/bin/python3.6
* /usr/bin/python is a symlink to 2.7
* /usr/bin/local/python (or any other location) is a symlink to 3.6 which shadows the former symlink
`sys.prefix` is `/usr` in this case, which is correct, but the `python` executable there points to the wrong version.

`run_pip` in the env fixes this already by using `sys.executable`, see https://github.com/python-poetry/poetry/blob/develop/poetry/utils/env.py#L964
This should be used in the executor as well.

Co-authored-by: Jonathan Striebel <jstriebel@users.noreply.github.com>

Merge develop into master

# Conflicts:
#	.github/workflows/release.yml
#	CHANGELOG.md
#	Makefile
#	make-linux-release.sh
#	poetry.lock
#	poetry/__version__.py
#	poetry/packages/locker.py
#	pyproject.toml
#	tests/packages/test_locker.py

Merge unreleased changes from master into develop

Release 1.0.10

Previously, the editable builder contained a regression that only
included poetry root when generating .pth files. This change ensure
that all package or module sources are included as per configuration.

Resolves: #2657

I think this should also fix the confusing syntax highlighting at https://python-poetry.org/docs/dependency-specification/#expanded-dependency-specification-syntax where the `platform_python_implementation == 'CPython'` string literal edited here is not currently highlighted as a literal string value.

This is a workaround for a bug in 1.0.9 causing a recursion error when
installing dependencies.

# Conflicts:
#	.github/workflows/main.yml
#	CHANGELOG.md
#	docs/docs/cli.md
#	get-poetry.py
#	poetry/packages/package.py
#	poetry/spdx/__init__.py
#	poetry/utils/env.py
#	poetry/vcs/git.py
#	tests/packages/test_package.py
#	tests/spdx/test_main.py
#	tests/utils/test_env.py

Until now poetry used the built-in venv module available in Python 3.
This has presented a few concerns. Chief of which has been
inconsistent environment setup. This includes, but is not limited to,
pip version used by the `ensurepip` module which is in turn used by the
built-in `venv.EnvBuilder`. Additionally, the `virtualenv` package
allows for faster environment creation. This can also allow us to, going
forward, drop ad-hoc code required to inspect and manage environments.

Previously, environment run method handled shell commands incorrectly
for windows platforms. This change ensures that command list to shell
conversion occurs after shell option is enforced.

Release 1.1.0a3

* Improve the way packages are installed

* Add support for parallelized operations

* Improve the Chooser class

* Make the new installer the default

* Add an Authenticator class to be able to download from protected urls

* Adapt code and tests to latest changes

* Update lock file and some dependencies

* Improve installations information and caching

* Make the final adjustments and tests for the new installer

* Use the preview version of Poetry for the CI

* Rename Executor.run() to Executor.run_pip()

* Gracefully handle errors when executing operations

* inspection: improve handling of sdist packages

This change ensures that inspection does not fail pre-maturely if
source does not contain a setup.py and no dependencies were
discovered.

Resolves: #2603

* inspection: add tests for package info discovery

Resolves: #2597

Ensure path requirement is converted to posix string.

Relates-to: #2398

Release 1.1.0a2