Remove package upper version limits

Marcel Looserequested to merge
remove-package-upper-version-limits into master

Removed the upper version limits for MOCpy and NumPy. Especiallly MOCpy gave trouble, because it's written in Rust and there are no binary wheels for the requested MOCpy version for newer Python version (like 3.12). This, for example, also caused the Readthedocs build to fail.

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