Fix annotations issue with Python 3.13 and NumPy 2.4

[timmens]

Closes #662

[timmens]

@hmgaudecker could you kindly check whether this fixes the problem?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
src/optimagic/constraints.py	85.41% <100.00%> (+0.10%)	⬆️

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[hmgaudecker]

For once I added a simple reproducer and still 😆

But yes, that works! Thanks a lot.