Finalize release v0.4.3

[mattwthompson]

Description

Closes #1251

Might want to include #1220, not planning to get #1252 in this release

Using https://github.com/openforcefield/openff-interchange/milestone/20

Using this as a double-check of merged PRs: v0.4.2...main

This is a similar report (I think these changes are all called out in release notes):

$ griffe check -a v0.4.2 -b HEAD openff.interchange
openff/interchange/components/interchange.py:906: Interchange.from_openmm(topology): Parameter is now required
openff/interchange/models.py:394: VirtualSiteKey: Public object points to a different kind of object: class -> attribute
openff/interchange/interop/gromacs/models/models.py:344: GROMACSSystem.molecules: Attribute value was changed: Field(dict(), description='The number of each molecule type in the system, keyed by the name of each molecule.') -> Field(list(), description='The number of each molecule type in the system, ordered topologically.')

Checklist

• Add tests
• Lint
• Update docstrings

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.86%. Comparing base (1b67e48) to head (37bb2ce).
⚠️ Report is 60 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1253   +/-   ##
=======================================
  Coverage   93.86%   93.86%           
=======================================
  Files          72       72           
  Lines        6240     6240           
=======================================
  Hits         5857     5857           
  Misses        383      383           

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