build(deps): update virtualenv requirement from ~=20.7 to ~=20.13

[dependabot]

Updates the requirements on virtualenv to permit the latest version.

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>`_)
v20.12.0 (2021-12-31)
Features - 20.12.0

• Sign the python2 exe on Darwin arm64 - by :user:tmspicer. ([#2233](https://github.com/pypa/virtualenv/issues/2233) <https://github.com/pypa/virtualenv/issues/2233>_)

Bugfixes - 20.12.0

- Fix ``--download`` option - by :user:`mayeut`. (`[#2120](https://github.com/pypa/virtualenv/issues/2120) <https://github.com/pypa/virtualenv/issues/2120>`_)
- Ugrade embedded setuptools to ``60.2.0`` from ``60.1.1`` - by :user:`gaborbernat`. (`[#2263](https://github.com/pypa/virtualenv/issues/2263) <https://github.com/pypa/virtualenv/issues/2263>`_)
v20.11.2 (2021-12-29)
Bugfixes - 20.11.2

• Fix installation of pinned versions of pip, setuptools & wheel - by :user:mayeut. ([#2203](https://github.com/pypa/virtualenv/issues/2203) <https://github.com/pypa/virtualenv/issues/2203>_)

... (truncated)

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
• 232a0b6 release 20.12.0
• Additional commits viewable in compare view

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[codecov-commenter]

Codecov Report

Merging #60 (6e97a01) into master (bcd59c8) will decrease coverage by 4.05%.
The diff coverage is 67.74%.

@@            Coverage Diff             @@
##           master      #60      +/-   ##
==========================================
- Coverage   55.00%   50.94%   -4.06%     
==========================================
  Files         124      123       -1     
  Lines        7243     7718     +475     
  Branches      752     1042     +290     
==========================================
- Hits         3984     3932      -52     
- Misses       3128     3632     +504     
- Partials      131      154      +23     

Impacted Files	Coverage Δ
benchbuild/utils/run.py	30.60% <0.00%> (-2.37%)	⬇️
benchbuild/source/git.py	69.56% <33.33%> (-8.77%)	⬇️
benchbuild/environments/adapters/podman.py	37.19% <38.61%> (-0.65%)	⬇️
benchbuild/cli/project.py	54.87% <39.21%> (-32.36%)	⬇️
benchbuild/environments/domain/declarative.py	77.58% <40.00%> (+12.67%)	⬆️
benchbuild/environments/service_layer/debug.py	40.00% <40.00%> (ø)
benchbuild/utils/slurm.py	73.75% <50.00%> (-4.34%)	⬇️
benchbuild/environments/adapters/buildah.py	53.36% <58.97%> (+20.80%)	⬆️
benchbuild/utils/revision_ranges.py	38.93% <61.90%> (-25.62%)	⬇️
benchbuild/environments/service_layer/ui.py	71.42% <64.70%> (+19.42%)	⬆️
... and 59 more

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[dependabot]

Superseded by #69.