chores: Python 3.13 in CI and use hatchling as build system #28

Job	Run time
lint / lint	19s
tests / build (3.9, windows-latest)	1m 13s
tests / build (3.11, ubuntu-latest)	26s
tests / build (3.11, macos-latest)	47s
tests / build (3.11, windows-latest)	1m 16s
tests / build (3.10, macos-latest)	50s
tests / build (3.10, ubuntu-latest)	16s
tests / build (3.10, windows-latest)	1m 0s
tests / build (3.12, ubuntu-latest)	19s
tests / build (3.13, macos-latest)	28s
tests / build (3.9, ubuntu-latest)	22s
tests / build (3.12, windows-latest)	1m 11s
tests / build (3.12, macos-latest)	58s
tests / build (3.13, ubuntu-latest)	19s
variants / build (3.9, macos-latest)	1m 41s
variants / build (3.13, ubuntu-latest)	1m 20s
variants / build (3.9, windows-latest)	3m 7s
typecheck / build	21s
variants / build (3.13, windows-latest)	3m 22s
variants / build (3.13, macos-latest)	1m 18s
tests / build (3.13, windows-latest)	55s
variants / build (3.9, ubuntu-latest)	1m 31s
Build & verify package	11s
Publish in-dev package to test.pypi.org	-1s
Publish released package to pypi.org	-1s
docs	0s
	23m 28s

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