chore: remove Python 3.9 from classifiers #1105

Job	Run time
Collect changes / collect-changes	10s
Python tests / unit-tests (py312)	8m 37s
Python tests / types-check	1m 42s
Python tests / unit-tests (py310)	2m 57s
Python tests / unit-tests (py311)	3m 46s
Python tests / lint-and-format-check	10s
Python tests / unit-tests (py313)	3m 30s
status-check	3s
	20m 55s

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