dropped Python 3.9 support #74

Job	Run time
lint / lint	11s
variants / build (3.10, ubuntu-latest)	31s
typecheck / build	18s
variants / build (3.10, macos-latest)	55s
variants / build (3.14, ubuntu-latest)	34s
variants / build (3.14, macos-latest)	54s
variants / build (3.10, windows-latest)	4m 3s
variants / build (3.14, windows-latest)	4m 17s
tests / build (3.10, ubuntu-latest)	12s
tests / build (3.10, windows-latest)	1m 9s
tests / build (3.11, windows-latest)	1m 17s
tests / build (3.11, macos-latest)	28s
tests / build (3.11, ubuntu-latest)	14s
tests / build (3.13, ubuntu-latest)	17s
tests / build (3.10, macos-latest)	23s
tests / build (3.12, macos-latest)	20s
tests / build (3.12, windows-latest)	1m 10s
tests / build (3.12, ubuntu-latest)	16s
tests / build (3.13, macos-latest)	25s
tests / build (3.14, windows-latest)	1m 11s
tests / build (3.14, macos-latest)	22s
tests / build (3.14, ubuntu-latest)	13s
tests / build (3.13, windows-latest)	47s
Publish in-dev package to test.pypi.org	0s
Build & verify package	0s
docs	-1s
Publish released package to pypi.org	-1s
	20m 25s

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