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Drop support for Python 3.9 #724

Job	Run time
build_linux (3.13)	3m 5s
build_linux (3.11)	3m 26s
build_linux (3.12)	3m 27s
build_windows (3.12)	10m 35s
build_windows (3.13)	7m 2s
build_linux (3.10)	3m 42s
build_windows (3.10)	11m 51s
build_windows (3.11)	10m 37s
test_linux (3.10, false, ubuntu-latest)	1m 36s
test_linux (3.11, false, ubuntu-latest)	1m 56s
test_linux (3.13, false, ubuntu-latest)	1m 43s
test_linux (3.12, false, ubuntu-latest)	1m 54s
test_windows (3.10, false, windows-latest)	3m 23s
test_windows (3.13, false, windows-latest)	3m 17s
test_windows (3.11, false, windows-latest)	4m 20s
test_windows (3.12, false, windows-latest)	3m 55s
	1h 15m 49s