Officially drop support for Python 3.7 and 3.8

[browniebroke]

Python 3.7 has EOL for more than a year, it's is not listed in the trove classifiers and is not part of the test suite. Python 3.8 has reached EOL earlier this month:

https://devguide.python.org/versions/

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[browniebroke]

@FlipperPA does this make sense? I'm also planing to drop Python 3.8 which reached EOL this month, and look into adding Python 3.13 support.

Then perhaps we could do a 2.5.0 release? WDYT?

[FlipperPA]

@browniebroke Absolutely, let's drop 3.8 as well, and a 2.5.0 release sounds great. Also, the new Trove Classifiers are merged in:
pypa/trove-classifiers#193