Bump pip from 21.0.1 to 21.2.4 in /.github/workflows

[dependabot]

Bumps pip from 21.0.1 to 21.2.4.

Changelog

Sourced from pip's changelog.

21.2.4 (2021-08-12)

Bug Fixes

• Fix 3.6.0 compatibility in link comparison logic. ([#10280](https://github.com/pypa/pip/issues/10280) <https://github.com/pypa/pip/issues/10280>_)

21.2.3 (2021-08-06)

Bug Fixes

• Modify the sysconfig.get_preferred_scheme function check to be compatible with CPython 3.10’s alphareleases. ([#10252](https://github.com/pypa/pip/issues/10252) <https://github.com/pypa/pip/issues/10252>_)

21.2.2 (2021-07-31)

Bug Fixes

• New resolver: When a package is specified with extras in constraints, and with extras in non-constraint requirements, the resolver now correctly identifies the constraint's existence and avoids backtracking. ([#10233](https://github.com/pypa/pip/issues/10233) <https://github.com/pypa/pip/issues/10233>_)

21.2.1 (2021-07-25)

Process

• The source distribution re-installation feature removal has been delayed to 21.3.

21.2 (2021-07-24)

Process

• pip freeze, pip list, and pip show no longer normalize underscore (_) in distribution names to dash (-). This is a side effect of the migration to importlib.metadata, since the underscore-dash normalization behavior is non-standard and specific to setuptools. This should not affect other parts of pip (for example, when feeding the pip freeze result back

... (truncated)

Commits

• 73fc5ff Bump for release
• 2d9bded Ignore warning on MSYS MINGW's incorrect sysconfig
• c1316c1 Suppress location warning caused by bpo-44860
• e959020 Move NameTuple method out of class
• c2c92c7 Bump for release
• 516fc49 Update AUTHORS.txt
• a00a044 Normalize sys.prefix for old virtualenv
• 00656aa Prevent returning relative paths for a location
• 41a8442 Use posix_prefix for Apple's system Python
• 3ecc391 More workaround for Debian's faulty sysconfig
• Additional commits viewable in compare view

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[github-actions]

Here are some friendly prose warnings from write-good:

In ./CHANGELOG.md
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- Update sphinx-click requirement from ^2.5.0 to ^3.0.1 [\#467](https://github.c
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- Update faker requirement from ^4.17.1 to ^5.3.0 [\#321](https://github.com/jmu
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In ./docker/README.md
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 will be approved by the European Commission - subsequent
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he European Commission - subsequent
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In ./.github/ISSUE_TEMPLATE/feature_request.md
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