Drop 3.9 support #804

Job	Run time
build-lint-test (3.10, windows-latest)	6h 0m 7s
build-lint-test (3.13, macos-intel)	10m 51s
build-lint-test (3.10, macos-intel)	6h 5m 0s
build-lint-test (3.13, macos-arm)	6m 5s
build-lint-test (3.10, ubuntu-latest)	6h 0m 14s
build-lint-test (3.13, ubuntu-latest)	8m 26s
build-lint-test (3.13, windows-latest)	11m 6s
build-lint-test (3.10, macos-arm)	6h 0m 18s
	1d 0h 42m 7s

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