support pydantic v1 and v2

[mikemhenry]

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

Patch coverage: 69.23% and project coverage change: -0.31% ⚠️

Comparison is base (25fb327) 91.29% compared to head (f641af7) 90.99%.
Report is 40 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #540      +/-   ##
==========================================
- Coverage   91.29%   90.99%   -0.31%     
==========================================
  Files         116      114       -2     
  Lines        7056     6882     -174     
==========================================
- Hits         6442     6262     -180     
- Misses        614      620       +6     

Files Changed	Coverage Δ
openfe/utils/handle_trajectories.py	0.00% <0.00%> (ø)
openfe/protocols/openmm_rfe/equil_rfe_settings.py	100.00% <100.00%> (ø)
openfe/protocols/openmm_utils/omm_settings.py	84.48% <100.00%> (+0.27%)	⬆️
openfe/setup/__init__.py	100.00% <100.00%> (ø)
...ork_planner/relative_alchemical_network_planner.py	97.59% <100.00%> (-0.03%)	⬇️
openfe/tests/utils/conftest.py	100.00% <100.00%> (ø)

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