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Drop support for Python 3.9 #734

Job	Run time
build_linux (3.10)	3m 6s
build_linux (3.13)	2m 37s
build_windows (3.12)	8m 58s
build_linux (3.11)	2m 58s
build_windows (3.10)	10m 5s
build_windows (3.11)	9m 42s
build_linux (3.12)	3m 26s
build_windows (3.13)	9m 37s
test_linux (3.10, false, ubuntu-latest)	2m 9s
test_linux (3.12, false, ubuntu-latest)	1m 51s
test_linux (3.11, false, ubuntu-latest)	1m 51s
test_linux (3.13, false, ubuntu-latest)	1m 54s
test_windows (3.12, false, windows-latest)	3m 18s
test_windows (3.11, false, windows-latest)	3m 15s
test_windows (3.10, false, windows-latest)	4m 48s
test_windows (3.13, false, windows-latest)	3m 11s
	1h 12m 46s