pin numpy to <2.0

[atravitz]

short-term fix for OpenFreeEnergy/ExampleNotebooks#197

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 92.58%. Comparing base (8cc3c4f) to head (8d9375b).
Report is 230 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1230      +/-   ##
==========================================
- Coverage   93.12%   92.58%   -0.54%     
==========================================
  Files         141      141              
  Lines       10685    10685              
==========================================
- Hits         9950     9893      -57     
- Misses        735      792      +57     

Flag	Coverage Δ
fast-tests	92.58% <ø> (?)
slow-tests	?

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