Log Message:
py-pip: updated to 20.3.3

20.3.3 (2020-12-15)
===================

Bug Fixes
---------
- Revert "Skip candidate not providing valid metadata", as that caused \ 
pip to be overeager about downloading from the package index.

20.3.2 (2020-12-15)
===================

Features
--------
- New resolver: Resolve direct and pinned (``==`` or ``===``) requirements first
  to improve resolver performance.
- Add a mechanism to delay resolving certain packages, and use it for setuptools.

Bug Fixes
---------
- New resolver: The "Requirement already satisfied" log is not printed \ 
only once
  for each package during resolution.
- Fix crash when logic for redacting authentication information from URLs
  in ``--help`` is given a list of strings, instead of a single string.
- New resolver: Correctly implement PEP 592. Do not return yanked versions from
  an index, unless the version range can only be satisfied by yanked candidates.
- New resolver: Make constraints also apply to package variants with extras, so
  the resolver correctly avoids backtracking on them.
- New resolver: Discard a candidate if it fails to provide metadata from source,
  or if the provided metadata is inconsistent, instead of quitting outright.

Vendored Libraries
------------------
- Update vendoring to 20.8

Improved Documentation
----------------------
- Update documentation to reflect that pip still uses legacy resolver by default \ 
in Python 2 environments.