[DEPENDABOT]: Bump pip from 20.2.3 to 20.3.1

[dependabot]

Bumps pip from 20.2.3 to 20.3.1.

Changelog

Sourced from pip's changelog.

20.3.1 (2020-12-03)

Deprecations and Removals

• The --build-dir option has been restored as a no-op, to soften the transition for tools that still used it. ([#9193](https://github.com/pypa/pip/issues/9193) <https://github.com/pypa/pip/issues/9193>_)

20.3 (2020-11-30)

Deprecations and Removals

• Remove --unstable-feature flag as it has been deprecated. ([#9133](https://github.com/pypa/pip/issues/9133) <https://github.com/pypa/pip/issues/9133>_)

Features

• Add support for :pep:600: Future 'manylinux' Platform Tags for Portable Linux Built Distributions. ([#9077](https://github.com/pypa/pip/issues/9077) <https://github.com/pypa/pip/issues/9077>_)
• The new resolver now resolves packages in a deterministic order. ([#9100](https://github.com/pypa/pip/issues/9100) <https://github.com/pypa/pip/issues/9100>_)
• Add support for MacOS Big Sur compatibility tags. ([#9138](https://github.com/pypa/pip/issues/9138) <https://github.com/pypa/pip/issues/9138>_)

Bug Fixes

• New Resolver: Rework backtracking and state management, to avoid getting stuck in an infinite loop. ([#9011](https://github.com/pypa/pip/issues/9011) <https://github.com/pypa/pip/issues/9011>_)
• New resolver: Check version equality with packaging.version to avoid edge cases if a wheel used different version normalization logic in its filename and metadata. ([#9083](https://github.com/pypa/pip/issues/9083) <https://github.com/pypa/pip/issues/9083>_)
• New resolver: Show each requirement in the conflict error message only once to reduce cluttering. ([#9101](https://github.com/pypa/pip/issues/9101) <https://github.com/pypa/pip/issues/9101>_)
• Fix a regression that made pip wheel generate zip files of editable requirements in the wheel directory. ([#9122](https://github.com/pypa/pip/issues/9122) <https://github.com/pypa/pip/issues/9122>_)
• Fix ResourceWarning in VCS subprocesses ([#9156](https://github.com/pypa/pip/issues/9156) <https://github.com/pypa/pip/issues/9156>_)
• Redact auth from URL in help message. ([#9160](https://github.com/pypa/pip/issues/9160) <https://github.com/pypa/pip/issues/9160>_)
• New Resolver: editable installations are done, regardless of whether the already-installed distribution is editable. ([#9169](https://github.com/pypa/pip/issues/9169) <https://github.com/pypa/pip/issues/9169>_)

Vendored Libraries

• Upgrade certifi to 2020.11.8
• Upgrade colorama to 0.4.4
• Upgrade packaging to 20.7
• Upgrade pep517 to 0.9.1
• Upgrade requests to 2.25.0
• Upgrade resolvelib to 0.5.3
• Upgrade toml to 0.10.2

... (truncated)

Commits

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[dependabot]

Superseded by #252.