Test packages on Python 3.13

[redeboer]

Python 3.13 was released this month. We should add Programming Language :: Python :: 3.13 to the classifiers in order to run the tests on this new Python release.

The following repositories contain classifiers that need to be updated:
https://github.com/search?q=org%3AComPWA+%22Programming+Language+%3A%3A+Python+%3A%3A+3.11%22+path%3Apyproject.toml&type=code

Related PRs

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1. BEHAVIOR: add Pyton 3.13 to version classifiers #501
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2. FIX: force ModifiablePyproject to be non-slotted #504
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