Bump pip from 19.3.1 to 20.2.3 in /python/helpers

[dependabot-preview]

Bumps pip from 19.3.1 to 20.2.3.

Changelog

Sourced from pip's changelog.

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)
• Disable caching for range requests, which causes corrupted wheels when pip tries to obtain metadata using the feature fast-deps. (#8701, #8716)
• Always use UTF-8 to read pyvenv.cfg to match the built-in venv. (#8717)
• 2020 Resolver: Correctly handle marker evaluation in constraints and exclude them if their markers do not match the current environment. (#8724)

20.2.1 (2020-08-04)

Features

• Ignore require-virtualenv in pip list (#8603)

Bug Fixes

• Correctly find already-installed distributions with dot (.) in the name and uninstall them when needed. (#8645)
• Trace a better error message on installation failure due to invalid .data files in wheels. (#8654)
• Fix SVN version detection for alternative SVN distributions. (#8665)
• New resolver: Correctly include the base package when specified with extras in --no-deps mode. (#8677)
• Use UTF-8 to handle ZIP archive entries on Python 2 according to PEP 427, so non-ASCII paths can be resolved as expected. (#8684)

Improved Documentation

• Add details on old resolver deprecation and removal to migration documentation. (#8371)
• Fix feature flag name in docs. (#8660)

20.2 (2020-07-29)

Commits

• 8c2102a Bump for release
• d8f0a7b Merge pull request #8752 from sbidoul/imp-8369-deprecation-sbi
• b98dd2d Merge pull request #8778 from hugovk/deprecate-3.5
• e16ebf1 Bump for release
• b9e403b Merge pull request #8716 from McSinyx/fix-range-request-cache
• 0ebe453 Merge pull request #8727 from uranusjr/new-resolver-constraint-markers
• 516c743 Merge pull request #8718 from uranusjr/pyvenv-cfg-encoding
• e04cd89 Merge pull request #8702 from uranusjr/get-distribution-looks-for-all
• 626d631 Merge pull request #8744 from hroncok/keyring_global_nope
• c7b4777 Merge pull request #8730 from McSinyx/news-8701-8716
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
• @dependabot badge me will comment on this PR with code to add a "Dependabot enabled" badge to your readme

Additionally, you can set the following in the .dependabot/config.yml file in this repo:

• Update frequency
• Automerge options (never/patch/minor, and dev/runtime dependencies)
• Out-of-range updates (receive only lockfile updates, if desired)
• Security updates (receive only security updates, if desired)

[dependabot-preview]

Superseded by #86.