bump to artifact v4

[atravitz]

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/.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.89%. Comparing base (829ce37) to head (5ae3ba4).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1146      +/-   ##
==========================================
- Coverage   93.53%   91.89%   -1.64%     
==========================================
  Files         142      142              
  Lines       10635    10635              
==========================================
- Hits         9947     9773     -174     
- Misses        688      862     +174     

Flag	Coverage Δ
fast-tests	91.89% <ø> (?)
slow-tests	?

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[atravitz]

@mikemhenry success: https://github.com/OpenFreeEnergy/openfe/actions/runs/13419020780/job/37486918974

[github-actions]

No API break detected ✅

[mikemhenry]

LGTM