Bump actions/checkout from 5 to 6 (#4) #18

Job	Run time
Build / Build source distribution	9s
Lint / Lint and type check with Python 3.10	30s
Lint / Lint and type check with Python 3.12	34s
Lint / Lint and type check with Python 3.11	35s
Lint / Lint and type check with Python 3.13	43s
Lint / Lint and type check with Python 3.14	44s
Test / Test with Python 3.14	16s
Test / Test with Python 3.12	14s
Test / Test with Python 3.13	11s
Test / Test with Python 3.10	15s
Test / Test with Python 3.11	11s
Release	-1s
	4m 21s

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