add news item for openmm 8.3 support

[atravitz]

In draft mode until we decide if this bugfix in openmm 8.3.1 is critical.

Checklist

• Added a news entry

Developers certificate of origin

• I certify that this contribution is covered by the MIT License here and the Developer Certificate of Origin at https://developercertificate.org/.

[github-actions]

No API break detected ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.14%. Comparing base (c8a6a3f) to head (9059e8d).
⚠️ Report is 97 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1446      +/-   ##
==========================================
- Coverage   95.19%   93.14%   -2.05%     
==========================================
  Files         165      165              
  Lines       12433    12433              
==========================================
- Hits        11835    11581     -254     
- Misses        598      852     +254     

Flag	Coverage Δ
fast-tests	93.14% <ø> (?)
slow-tests	?

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[IAlibay]

All good to go with 8.3. Pressure issue only affected reporting.