Bump pip from 20.0.2 to 21.1.1

[dependabot-preview]

Bumps pip from 20.0.2 to 21.1.1.

Changelog

Sourced from pip's changelog.

21.1.1 (2021-04-30)

Deprecations and Removals

• Temporarily set the new "Value for ... does not match" location warnings level to DEBUG, to hide them from casual users. This prepares pip 21.1 for CPython inclusion, while pip maintainers digest the first intake of location mismatch issues for the distutils-sysconfig transition. (#9912)

Bug Fixes

• This change fixes a bug on Python <=3.6.1 with a Typing feature added in 3.6.2 (#9831)
• Fix compatibility between distutils and sysconfig when the project name is unknown outside of a virtual environment. (#9838)
• Fix Python 3.6 compatibility when a PEP 517 build requirement itself needs to be built in an isolated environment. (#9878)

21.1 (2021-04-24)

Process

• Start installation scheme migration from distutils to sysconfig. A warning is implemented to detect differences between the two implementations to encourage user reports, so we can avoid breakages before they happen.

Features

• Add the ability for the new resolver to process URL constraints. (#8253)
• Add a feature --use-feature=in-tree-build to build local projects in-place when installing. This is expected to become the default behavior in pip 21.3; see Installing from local packages for more information. (#9091)
• Bring back the "(from versions: ...)" message, that was shown on resolution failures. (#9139)
• Add support for editable installs for project with only setup.cfg files. (#9547)
• Improve performance when picking the best file from indexes during pip install. (#9748)
• Warn instead of erroring out when doing a PEP 517 build in presence of --build-option. Warn when doing a PEP 517 build in presence of --global-option. (#9774)

Bug Fixes

• Fixed --target to work with --editable installs. (#4390)
• Add a warning, discouraging the usage of pip as root, outside a virtual environment. (#6409)
• Ignore .dist-info directories if the stem is not a valid Python distribution name, so they don't show up in e.g. pip freeze. (#7269)
• Only query the keyring for URLs that actually trigger error 401. This prevents an unnecessary keyring unlock prompt on every pip install invocation (even with default index URL which is not password protected). (#8090)
• Prevent packages already-installed alongside with pip to be injected into an isolated build environment during build-time dependency population. (#8214)
• Fix pip freeze permission denied error in order to display an understandable error message and offer solutions. (#8418)
• Correctly uninstall script files (from setuptools' scripts argument), when installed with --user. (#8733)
• New resolver: When a requirement is requested both via a direct URL (req @ URL) and via version specifier with extras (req[extra]), the resolver will now be able to use the URL to correctly resolve the requirement with extras. (#8785)
• New resolver: Show relevant entries from user-supplied constraint files in the error message to improve debuggability. (#9300)
• Avoid parsing version to make the version check more robust against lousily debundled downstream distributions. (#9348)
• --user is no longer suggested incorrectly when pip fails with a permission error in a virtual environment. (#9409)
• Fix incorrect reporting on Requires-Python conflicts. (#9541)
• Make wheel compatibility tag preferences more important than the build tag (#9565)
• Fix pip to work with warnings converted to errors. (#9779)

... (truncated)

Commits

• c53d88c Bump for release
• 4417e7f Update AUTHORS.txt
• 0c29bfe Merge pull request #9912 from uranusjr/sysconfig-remove-warning-for-python-re...
• f56ec32 Make location mismatch messages DEBUG level
• 999b121 Merge pull request #9883 from uranusjr/isolated-pip-py36-compat
• f884203 Fallback to self-invoke via directory on 3.6
• 7a77484 Merge pull request #9835 from jamescurtin/9831-bugfix
• 914bcc3 Merge pull request #9838 from uranusjr/sysconfig-header-with-none-project
• 2a009a0 Better explanatory comment
• e7b1722 Set dist_name to UNKNOWN when empty outside venv
• Additional commits viewable in compare view

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[coveralls]

Coverage remained the same at 42.065% when pulling a5e0ec9 on dependabot/pip/pip-21.1.1 into 10a4d82 on master.

[dependabot-preview]

Superseded by #616.