Bump pip from 20.0.2 to 20.2.4

[dependabot-preview]

Bumps pip from 20.0.2 to 20.2.4.

Changelog

Sourced from pip's changelog.

20.2.4 (2020-10-16)

Deprecations and Removals

• Document that certain removals can be fast tracked. (#8417)
• Document that Python versions are generally supported until PyPI usage falls below 5%. (#8927)

Features

• New resolver: Avoid accessing indexes when the installed candidate is preferred and considered good enough. (#8023)
• Improve error message friendliness when an environment has packages with corrupted metadata. (#8676)
• Cache package listings on index packages so they are guarenteed to stay stable during a pip command session. This also improves performance when a index page is accessed multiple times during the command session. (#8905)
• New resolver: Tweak resolution logic to improve user experience when user-supplied requirements conflict. (#8924)

Bug Fixes

• New resolver: Correctly respect Requires-Python metadata to reject incompatible packages in --no-deps mode. (#8758)
• New resolver: Pick up hash declarations in constraints files and use them to filter available distributions. (#8792)
• New resolver: If a package appears multiple times in user specification with different --hash options, only hashes that present in all specifications should be allowed. (#8839)

Improved Documentation

• Add ux documentation (#8807)

20.2.3 (2020-09-08)

Deprecations and Removals

• Deprecate support for Python 3.5 (#8181)

Features

• Make the setup.py install deprecation warning less noisy. We warn only when setup.py install succeeded and setup.py bdist_wheel failed, as situations where both fails are most probably irrelevant to this deprecation. (#8752)

20.2.2 (2020-08-11)

Bug Fixes

• Only attempt to use the keyring once and if it fails, don't try again. This prevents spamming users with several keyring unlock prompts when they cannot unlock or don't want to do so. (#8090)
• Fix regression that distributions in system site-packages are not correctly found when a virtual environment is configured with system-site-packages on. (#8695)

Commits

• 57dd580 Bump for release
• 6a8956d Merge pull request #8932 from uranusjr/new-resolver-lazy-sequence
• 4aec7e8 Merge pull request #8758 from uranusjr/new-resolver-requires-python-when-no-deps
• 0a637fa Merge pull request #8942 from brainwane/docs-8661
• c8533f0 Merge pull request #8933 from brainwane/put-key-links-on-front-page
• 74f48cf Merge pull request #8927 from hugovk/document-python-support-policy
• ff5a9b5 Merge pull request #8926 from uranusjr/dont-crash-on-check
• ae4d271 Merge pull request #8924 from uranusjr/new-resolver-try-user-requested-combin...
• 314de5a Merge pull request #8912 from uranusjr/cache-found-candidates
• e7e62d8 Merge pull request #8873 from hugovk/docs-3-months-deprecation
• Additional commits viewable in compare view

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[coveralls]

Coverage remained the same at 42.065% when pulling fdf34de on dependabot/pip/pip-20.2.4 into 10a4d82 on master.

[dependabot-preview]

Superseded by #504.