Bump pip from 20.2.4 to 21.0.1 in /.github/workflows

[dependabot]

Bumps pip from 20.2.4 to 21.0.1.

Changelog

Sourced from pip's changelog.

21.0.1 (2021-01-30)

Bug Fixes

• commands: debug: Use packaging.version.parse to compare between versions. ([#9461](https://github.com/pypa/pip/issues/9461) <https://github.com/pypa/pip/issues/9461>_)
• New resolver: Download and prepare a distribution only at the last possible moment to avoid unnecessary network access when the same version is already installed locally. ([#9516](https://github.com/pypa/pip/issues/9516) <https://github.com/pypa/pip/issues/9516>_)

Vendored Libraries

• Upgrade packaging to 20.9

21.0 (2021-01-23)

Deprecations and Removals

• Drop support for Python 2. ([#6148](https://github.com/pypa/pip/issues/6148) <https://github.com/pypa/pip/issues/6148>_)
• Remove support for legacy wheel cache entries that were created with pip versions older than 20.0. ([#7502](https://github.com/pypa/pip/issues/7502) <https://github.com/pypa/pip/issues/7502>_)
• Remove support for VCS pseudo URLs editable requirements. It was emitting deprecation warning since version 20.0. ([#7554](https://github.com/pypa/pip/issues/7554) <https://github.com/pypa/pip/issues/7554>_)
• Modernise the codebase after Python 2. ([#8802](https://github.com/pypa/pip/issues/8802) <https://github.com/pypa/pip/issues/8802>_)
• Drop support for Python 3.5. ([#9189](https://github.com/pypa/pip/issues/9189) <https://github.com/pypa/pip/issues/9189>_)
• Remove the VCS export feature that was used only with editable VCS requirements and had correctness issues. ([#9338](https://github.com/pypa/pip/issues/9338) <https://github.com/pypa/pip/issues/9338>_)

Features

• Add --ignore-requires-python support to pip download. ([#1884](https://github.com/pypa/pip/issues/1884) <https://github.com/pypa/pip/issues/1884>_)
• New resolver: Error message shown when a wheel contains inconsistent metadata is made more helpful by including both values from the file name and internal metadata. ([#9186](https://github.com/pypa/pip/issues/9186) <https://github.com/pypa/pip/issues/9186>_)

Bug Fixes

• Fix a regression that made pip wheel do a VCS export instead of a VCS clone for editable requirements. This broke VCS requirements that need the VCS information to build correctly. ([#9273](https://github.com/pypa/pip/issues/9273) <https://github.com/pypa/pip/issues/9273>_)
• Fix pip download of editable VCS requirements that need VCS information to build correctly. ([#9337](https://github.com/pypa/pip/issues/9337) <https://github.com/pypa/pip/issues/9337>_)

... (truncated)

Commits

• 22c6efd Bump for release
• a085068 Update AUTHORS.txt
• 00fb5a0 Merge pull request #9533 from henryiii/chore/packaging-20.9
• c7ace4d Upgrade packaging to 20.9
• d1aa391 Merge pull request #9497 from hugovk/update-docs-tense
• 55d2969 Merge pull request #9522 from uranusjr/no-dup-fetch
• 7d43ec5 More permissive output check
• 2e70ec0 Create the candidate lazily to avoid download
• 68a86c5 Failing test for repeated fetch
• fa0ee31 Merge pull request #9504 from sbidoul/improve-pre-commit-sbi
• Additional commits viewable in compare view

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