chore: remove support for python 3.9 #2401

Job	Run time
check-docs	2m 3s
lint / lint	3m 25s
unit-tests (ubuntu-latest, 3.10) / unit-tests	6m 2s
unit-tests (ubuntu-latest, 3.11) / unit-tests	6m 58s
unit-tests (ubuntu-latest, 3.12) / unit-tests	7m 48s
unit-tests (windows-latest, 3.10) / unit-tests	8m 47s
unit-tests (windows-latest, 3.11) / unit-tests	10m 22s
unit-tests (windows-latest, 3.12) / unit-tests	12m 26s
	57m 51s

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