Bump pip from 21.2.4 to 21.3.1

[dependabot]

Bumps pip from 21.2.4 to 21.3.1.

Changelog

Sourced from pip's changelog.

21.3.1 (2021-10-22)

Bug Fixes

• Always refuse installing or building projects that have no pyproject.toml nor setup.py. ([#10531](https://github.com/pypa/pip/issues/10531) <https://github.com/pypa/pip/issues/10531>_)
• Tweak running-as-root detection, to check os.getuid if it exists, on Unix-y and non-Linux/non-MacOS machines. ([#10565](https://github.com/pypa/pip/issues/10565) <https://github.com/pypa/pip/issues/10565>_)
• When installing projects with a pyproject.toml in editable mode, and the build backend does not support :pep:660, prepare metadata using prepare_metadata_for_build_wheel instead of setup.py egg_info. Also, refuse installing projects that only have a setup.cfg and no setup.py nor pyproject.toml. These restore the pre-21.3 behaviour. ([#10573](https://github.com/pypa/pip/issues/10573) <https://github.com/pypa/pip/issues/10573>_)
• Restore compatibility of where configuration files are loaded from on MacOS (back to Library/Application Support/pip, instead of Preferences/pip). ([#10585](https://github.com/pypa/pip/issues/10585) <https://github.com/pypa/pip/issues/10585>_)

Vendored Libraries

• Upgrade pep517 to 0.12.0

21.3 (2021-10-11)

Deprecations and Removals

• Improve deprecation warning regarding the copying of source trees when installing from a local directory. ([#10128](https://github.com/pypa/pip/issues/10128) <https://github.com/pypa/pip/issues/10128>_)
• Suppress location mismatch warnings when pip is invoked from a Python source tree, so ensurepip does not emit warnings on CPython make install. ([#10270](https://github.com/pypa/pip/issues/10270) <https://github.com/pypa/pip/issues/10270>_)
• On Python 3.10 or later, the installation scheme backend has been changed to use sysconfig. This is to anticipate the deprecation of distutils in Python 3.10, and its scheduled removal in 3.12. For compatibility considerations, pip installations running on Python 3.9 or lower will continue to use distutils. ([#10358](https://github.com/pypa/pip/issues/10358) <https://github.com/pypa/pip/issues/10358>_)
• Remove the --build-dir option and aliases, one last time. ([#10485](https://github.com/pypa/pip/issues/10485) <https://github.com/pypa/pip/issues/10485>_)
• In-tree builds are now the default. --use-feature=in-tree-build is now ignored. --use-deprecated=out-of-tree-build may be used temporarily to ease the transition. ([#10495](https://github.com/pypa/pip/issues/10495) <https://github.com/pypa/pip/issues/10495>_)
• Un-deprecate source distribution re-installation behaviour. ([#8711](https://github.com/pypa/pip/issues/8711) <https://github.com/pypa/pip/issues/8711>_)

Features

• Replace vendored appdirs with platformdirs. ([#10202](https://github.com/pypa/pip/issues/10202) <https://github.com/pypa/pip/issues/10202>_)
• Support PEP 610 <https://www.python.org/dev/peps/pep-0610/>_ to detect editable installs in pip freeze and pip list. The pip list column output

... (truncated)

Commits

• f9914f3 Bump for release
• f9f2db2 Update AUTHORS.txt
• f2d776b Merge pull request #10607 from pradyunsg/fix-docs-builds
• 4a4b613 Merge PR #10577 from sbidoul/fix-pep660-metadata-preparation-fallback
• f4d67ba Merge pull request #10592 from pradyunsg/update-ewdurbin-name
• 37aef10 Merge pull request #10536 from pradyunsg/docs/fix-wordin
• 457564c Merge pull request #10585 from pradyunsg/fix-config-paths
• 8c1f333 Merge pull request #10580 from pradyunsg/better-towncrier-template
• cc559ed Merge pull request #10583 from pradyunsg/fix-vendoring
• 0c2574b Merge pull request #10566 from n1000/dont_warn_on_bsd
• Additional commits viewable in compare view

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[codecov]

Codecov Report

Merging #103 (bfcc16a) into main (4e28810) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #103   +/-   ##
=======================================
  Coverage   98.46%   98.46%           
=======================================
  Files          14       14           
  Lines         780      780           
=======================================
  Hits          768      768           
  Misses         12       12           

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[dependabot]

Superseded by #115.