Unpin numpy, bump pybammsolvers

[MarcBerliner]

Description

Fixes #4183

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #)

Important checks:

Please confirm the following before marking the PR as ready for review:

• No style issues: nox -s pre-commit
• All tests pass: nox -s tests
• The documentation builds: nox -s doctests
• Code is commented for hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.80%. Comparing base (b4073b4) to head (4a852a7).
⚠️ Report is 88 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5204      +/-   ##
===========================================
- Coverage    98.80%   98.80%   -0.01%     
===========================================
  Files          320      320              
  Lines        27074    27072       -2     
===========================================
- Hits         26750    26748       -2     
  Misses         324      324              

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[agriyakhetarpal]

Thanks, @MarcBerliner! Please let me know when this is ready

[DavidMStraub]

🥳