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Drop support for Python 3.9 #726

Job	Run time
build_windows (3.10)	9m 34s
build_windows (3.13)	9m 21s
build_linux (3.13)	2m 52s
build_linux (3.10)	3m 21s
build_windows (3.11)	7m 59s
build_windows (3.12)	10m 22s
build_linux (3.11)	3m 1s
build_linux (3.12)	3m 5s
test_linux (3.11, false, ubuntu-latest)	1m 12s
test_linux (3.10, false, ubuntu-latest)	1m 34s
test_linux (3.12, false, ubuntu-latest)	2m 8s
test_linux (3.13, false, ubuntu-latest)	1m 43s
test_windows (3.12, false, windows-latest)	3m 32s
test_windows (3.10, false, windows-latest)	3m 8s
test_windows (3.13, false, windows-latest)	3m 20s
test_windows (3.11, false, windows-latest)	3m 25s
	1h 9m 37s