pin to python < 3.14 in pyproject.toml

[atravitz]

#1567 (comment)

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 ✅

[mikemhenry]

I don't think we need an upper bound on our python version support. IMHO it just makes it hard to install in a python 3.14 environment and I am not sure what the upsides are. I saw #1567 (comment) and it actually looks like we are blocked by the openff-* ecosystem https://github.com/conda-forge/openff-toolkit-feedstock/blob/main/recipe/meta.yaml

I know we didn't have an upper bound on our last release, but if we did, that means if tomorrow openff-* supported python 3.14, a user wouldn't be able to install openfe in python 3.14

tl;dr I think our requirements should be what our code requires and not what functionally happens (sone dependency not supporting a python version) at some point in time.

P.S. Right now openmm 8.4 doesn't have python 3.14 builds (there is an RC) BUT if tomorrow they did, we still couldn't install our software in a python 3.14 environment b/c of openf-*

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.88%. Comparing base (fe2d11c) to head (fdea483).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1629      +/-   ##
==========================================
- Coverage   95.33%   92.88%   -2.45%     
==========================================
  Files         183      183              
  Lines       15763    15763              
==========================================
- Hits        15028    14642     -386     
- Misses        735     1121     +386     

Flag	Coverage Δ
fast-tests	92.88% <ø> (?)
slow-tests	?

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[atravitz]

@mikemhenry - I think your opinion here follows our general best-practice, so I'm closing this PR 👍