Bump pip from 19.3.1 to 20.0.2 in /docker/build_scripts

[dependabot-preview]

Bumps pip from 19.3.1 to 20.0.2.

Changelog

Sourced from pip's changelog.

20.0.2 (2020-01-24)

Bug Fixes

• Fix a regression in generation of compatibility tags. (#7626)

Vendored Libraries

• Upgrade packaging to 20.1

20.0.1 (2020-01-21)

Bug Fixes

• Rename an internal module, to avoid ImportErrors due to improper uninstallation. (#7621)

20.0 (2020-01-21)

Process

• Switch to a dedicated CLI tool for vendoring dependencies.

Deprecations and Removals

• Remove wheel tag calculation from pip and use packaging.tags. This should provide more tags ordered better than in prior releases. (#6908)
• Deprecate setup.py-based builds that do not generate an .egg-info directory. (#6998)
• The pip>=20 wheel cache is not retro-compatible with previous versions. Until pip 21.0, pip will continue to take advantage of existing legacy cache entries. (#7296)
• Deprecate undocumented --skip-requirements-regex option. (#7297)
• Deprecate passing install-location-related options via --install-option. (#7309)
• Use literal "abi3" for wheel tag on CPython 3.x, to align with PEP 384 which only defines it for this platform. (#7327)
• Remove interpreter-specific major version tag e.g. cp3-none-any from consideration. This behavior was not documented strictly, and this tag in particular is not useful. Anyone with a use case can create an issue with pypa/packaging. (#7355)
• Wheel processing no longer permits wheels containing more than one top-level .dist-info directory. (#7487)
• Support for the git+git@ form of VCS requirement is being deprecated and will be removed in pip 21.0. Switch to git+https:// or git+ssh://. git+git:// also works but its use is discouraged as it is insecure. (#7543)

Features

• Default to doing a user install (as if --user was passed) when the main site-packages directory is not writeable and user site-packages are enabled. (#1668)
• Warn if a path in PATH starts with tilde during pip install. (#6414)
• Cache wheels built from Git requirements that are considered immutable, because they point to a commit hash. (#6640)
• Add option --no-python-version-warning to silence warnings related to deprecation of Python versions. (#6673)
• Cache wheels that pip wheel built locally, matching what pip install does. This particularly helps performance in workflows where pip wheel is used for building before installing. Users desiring the original behavior can use pip wheel --no-cache-dir. (#6852)

... (truncated)

Commits

• 931749f Bump for release
• 2f6cd83 Merge pull request #7643 from pradyunsg/vendoring/update-packaging
• 1cf779c Add a NEWS fragment for release notes
• 78a7722 Upgrade packaging to 20.1
• 1d17df6 Merge pull request #7641 from pfmoore/gitattributes_fix
• 848472e Modify gitattributes to match changed location of vendoring patches
• 54f9f83 Merge pull request #7639 from pypa/revert-7600-release-rewrite-lineendings
• 3894431 Revert "Explicitly set newline when rewriting for release (#7600)"
• f1cd4cb Merge pull request #7608 from uranusjr/global-cleanup
• ea7def8 Merge pull request #7624 from pradyunsg/automation/release-process-improvements
• Additional commits viewable in compare view

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