Bump virtualenv from 20.4.7 to 20.7.2 in /.github/workflows

[dependabot]

Bumps virtualenv from 20.4.7 to 20.7.2.

Changelog

Sourced from virtualenv's changelog.

v20.7.2 (2021-08-10)

Bugfixes - 20.7.2

- Upgrade embedded pip to ``21.2.3`` from ``21.2.2`` and wheel to ``0.37.0`` from ``0.36.2`` - by :user:`gaborbernat`. (`[#2168](https://github.com/pypa/virtualenv/issues/2168) <https://github.com/pypa/virtualenv/issues/2168>`_)
v20.7.1 (2021-08-09)
Bugfixes - 20.7.1

• Fix unpacking dictionary items in PythonInfo.install_path ([#2165](https://github.com/pypa/virtualenv/issues/2165) <https://github.com/pypa/virtualenv/issues/2165>_)

v20.7.0 (2021-07-31)

Bugfixes - 20.7.0

- upgrade embedded pip to ``21.2.2`` from ``21.1.3`` and setuptools to ``57.4.0`` from ``57.1.0`` - by :user:`gaborbernat` (`[#2159](https://github.com/pypa/virtualenv/issues/2159) <https://github.com/pypa/virtualenv/issues/2159>`_)
Deprecations and Removals - 20.7.0

• Removed xonsh activator due to this breaking fairly often the CI and lack of support from those packages maintainers, upstream is encouraged to continue supporting the project as a plugin <https://github.com/xonsh/xonsh/issues/3689>_ - by :user:gaborbernat. ([#2160](https://github.com/pypa/virtualenv/issues/2160) <https://github.com/pypa/virtualenv/issues/2160>_)

v20.6.0 (2021-07-14)

Features - 20.6.0

- Support Python interpreters without ``distutils`` (fallback to ``syconfig`` in these cases) - by :user:`gaborbernat`. (`[#1910](https://github.com/pypa/virtualenv/issues/1910) <https://github.com/pypa/virtualenv/issues/1910>`_)
v20.5.0 (2021-07-13)
Features - 20.5.0

• Plugins now use 'selectable' entry points - by :user:jaraco. ([#2093](https://github.com/pypa/virtualenv/issues/2093) <https://github.com/pypa/virtualenv/issues/2093>_)
• add libffi-7.dll to the hard-coded list of dlls for PyPy ([#2141](https://github.com/pypa/virtualenv/issues/2141) <https://github.com/pypa/virtualenv/issues/2141>_)
• Use the better maintained platformdirs instead of appdirs - by :user:gaborbernat. ([#2142](https://github.com/pypa/virtualenv/issues/2142) <https://github.com/pypa/virtualenv/issues/2142>_)

Bugfixes - 20.5.0

- Bump pip the embedded pip ``21.1.3`` and setuptools to ``57.1.0`` - by :user:`gaborbernat`. (`[#2135](https://github.com/pypa/virtualenv/issues/2135) <https://github.com/pypa/virtualenv/issues/2135>`_)
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Commits

• 7bf206e release 20.7.2
• 494e2c0 Bump pip and wheel (#2168)
• 65d1829 [pre-commit.ci] pre-commit autoupdate (#2167)
• ba79a08 Merge pull request #2166 from pypa/release-20.7.1
• 7f46546 release 20.7.1
• 3f231f2 fix ValueError when unpacking (#2165)
• 8394049 Move to 3.10.0-rc.1
• 4a28e2e Merge pull request #2161 from pypa/release-20.7.0
• f418ffb release 20.7.0
• 7b1e4b4 Upgrade pip and setuptools (#2159)
• Additional commits viewable in compare view

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Superseded by #130.