Bump virtualenv from 20.9.0 to 20.10.0 in /.github/workflows

[dependabot]

Bumps virtualenv from 20.9.0 to 20.10.0.

Changelog

Sourced from virtualenv's changelog.

v20.10.0 (2021-11-01)

Features - 20.10.0

- If a ``"venv"`` install scheme exists in ``sysconfig``, virtualenv now uses it to create new virtual environments.
  This allows Python distributors, such as Fedora, to patch/replace the default install scheme without affecting
  the paths in new virtual environments.
  A similar technique `was proposed to Python, for the venv module <https://bugs.python.org/issue45413>`_ - by ``hroncok`` (`[#2208](https://github.com/pypa/virtualenv/issues/2208) <https://github.com/pypa/virtualenv/issues/2208>`_)
- The activated virtualenv prompt is now always wrapped in parentheses. This
  affects venvs created with the ``--prompt`` attribute, and matches virtualenv's
  behaviour on par with venv. (`[#2224](https://github.com/pypa/virtualenv/issues/2224) <https://github.com/pypa/virtualenv/issues/2224>`_)
Bugfixes - 20.10.0

• Fix broken prompt set up by activate.bat - by :user:SiggyBar. ([#2225](https://github.com/pypa/virtualenv/issues/2225) <https://github.com/pypa/virtualenv/issues/2225>_)

Commits

• 2f4e266 release 20.10.0
• 15c09d6 ?? prompt should be wrapped in paranthesis ?? (#2224)
• 8da79db Favor the "venv" sysconfig install scheme over the default and distutils sche...
• 31f3913 Fix broken prompt set up by activate.bat (#2225) (#2226)
• 653d4eb Fix docs
• a13e51e Merge pull request #2223 from pypa/release-20.9.0
• See full diff in compare view

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[Vinye]

@dependabot rebase