Bump actions/checkout from 5 to 6 #1534

Job	Run time
list	9s
ci (macos-latest, tests-3.13)	44s
ci (macos-latest, tests-3.10)	1m 5s
ci (macos-latest, tests-3.11)	53s
ci (macos-latest, tests-3.12)	1m 11s
ci (macos-latest, tests-pypy3.11)	1m 6s
ci (macos-latest, docs(dirhtml))	1m 26s
ci (macos-latest, tests-3.14)	54s
ci (macos-latest, docs(doctest))	1m 20s
ci (macos-latest, style)	1m 10s
ci (macos-latest, docs(linkcheck))	53s
ci (macos-latest, typing)	1m 8s
ci (macos-latest, docs(style))	1m 8s
ci (macos-latest, docs(spelling))	1m 24s
ci (ubuntu-latest, tests-pypy3.11)	17s
ci (ubuntu-latest, tests-3.10)	36s
ci (ubuntu-latest, tests-3.14)	18s
ci (ubuntu-latest, tests-3.12)	17s
ci (macos-latest, docs(man))	1m 34s
ci (ubuntu-latest, tests-3.11)	18s
ci (ubuntu-latest, docs(doctest))	41s
ci (ubuntu-latest, docs(dirhtml))	45s
ci (ubuntu-latest, docs(spelling))	49s
ci (ubuntu-latest, tests-3.13)	19s
ci (ubuntu-latest, docs(style))	32s
ci (macos-latest, build)	58s
ci (ubuntu-latest, docs(man))	46s
ci (ubuntu-latest, docs(linkcheck))	50s
ci (ubuntu-latest, style)	14s
ci (ubuntu-latest, typing)	20s
ci (ubuntu-latest, build)	29s
packaging	12s
	24m 46s

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