Support numpy>=2

[timmens]

• Make optimagic compatible with numpy>=2
• Test optimagic with numpy<2 and numpy>=2:
  1. First test is pandas<2 and numpy<2
  2. Second test is pandas>= 2 and numpy<2
  3. Perform all other tests with numpy>=2
• Pin mypy (should be the same version as used in the pre-commit hook)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Files with missing lines	Coverage Δ
...imagic/differentiation/richardson_extrapolation.py	90.74% <100.00%> (ø)
src/optimagic/optimizers/_pounders/gqtpar.py	90.54% <100.00%> (ø)
src/optimagic/parameters/kernel_transformations.py	99.17% <100.00%> (ø)

... and 1 file with indirect coverage changes

[janosg]

Thanks!