Bump virtualenv from 20.12.0 to 20.13.0 in /.github/workflows

[dependabot]

Bumps virtualenv from 20.12.0 to 20.13.0.

Changelog

Sourced from virtualenv's changelog.

v20.13.0 (2022-01-02)

Features - 20.13.0

- Add downloaded wheel information in the relevant JSON embed file to
  prevent additional downloads of the same wheel. - by :user:`mayeut`. (`[#2268](https://github.com/pypa/virtualenv/issues/2268) <https://github.com/pypa/virtualenv/issues/2268>`_)
Bugfixes - 20.13.0

• Fix AttributeError: 'bool' object has no attribute 'error' when creating a Python 2.x virtualenv on macOS - by moreati. ([#2269](https://github.com/pypa/virtualenv/issues/2269) <https://github.com/pypa/virtualenv/issues/2269>_)
• Fix PermissionError: [Errno 1] Operation not permitted when creating a Python 2.x virtualenv on macOS/arm64 - by moreati. ([#2271](https://github.com/pypa/virtualenv/issues/2271) <https://github.com/pypa/virtualenv/issues/2271>_)

v20.12.1 (2022-01-01)

Bugfixes - 20.12.1

- Try using previous updates of ``pip``, ``setuptools`` & ``wheel``
  when inside an update grace period rather than always falling back
  to embedded wheels - by :user:`mayeut`. (`[#2265](https://github.com/pypa/virtualenv/issues/2265) <https://github.com/pypa/virtualenv/issues/2265>`_)
- New patch versions of ``pip``, ``setuptools`` & ``wheel`` are now
  returned in the expected timeframe. - by :user:`mayeut`. (`[#2266](https://github.com/pypa/virtualenv/issues/2266) <https://github.com/pypa/virtualenv/issues/2266>`_)
- Manual upgrades of ``pip``, ``setuptools`` & ``wheel`` are
  not discarded by a periodic update - by :user:`mayeut`. (`[#2267](https://github.com/pypa/virtualenv/issues/2267) <https://github.com/pypa/virtualenv/issues/2267>`_)

Commits

• 568136c release 20.13.0
• e813ac1 PyPy: glob for required dlls, check they exist (#2274)
• 856933e fix: Correctly remove bk dir when re-signing macOS Python 2.x executable (#2272)
• 50c5591 fix: AttributeError on macOS creating a Python 2.x virtualenv (#2270)
• 319a540 feature: cache downloaded wheel information (#2276)
• 5f65057 Merge pull request #2275 from pypa/release-20.12.1
• 8799266 release 20.12.1
• 4308ddb feature: store version update source in embed JSON file (#2273)
• 51408e6 Merge pull request #2264 from pypa/release-20.12.0
• See full diff in compare view

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[andrewbolster]

@dependabot rebase

[andrewbolster]

@dependabot rebase