Bump actions/checkout from 5 to 6 #982

Job	Run time
list	8s
ci (macos-latest, tests-3.10)	1m 6s
ci (macos-latest, tests-pypy3.10)	1m 33s
ci (macos-latest, tests-3.12)	1m 5s
ci (macos-latest, tests-3.13)	1m 9s
ci (macos-latest, tests-3.11)	1m 17s
ci (macos-latest, audit)	1m 18s
ci (macos-latest, docs(man))	1m 23s
ci (macos-latest, typing)	57s
ci (macos-latest, docs(doctest))	1m 24s
ci (ubuntu-latest, tests-3.11)	19s
ci (macos-latest, secrets)	57s
ci (macos-latest, style)	1m 8s
ci (macos-latest, docs(spelling))	1m 28s
ci (macos-latest, docs(dirhtml))	1m 28s
ci (ubuntu-latest, tests-pypy3.10)	27s
ci (macos-latest, build)	1m 0s
ci (ubuntu-latest, tests-3.10)	41s
ci (macos-latest, docs(linkcheck))	1m 36s
ci (macos-latest, docs(style))	1m 31s
ci (ubuntu-latest, tests-3.12)	19s
ci (ubuntu-latest, docs(doctest))	31s
ci (ubuntu-latest, audit)	16s
ci (ubuntu-latest, tests-3.13)	14s
ci (ubuntu-latest, docs(dirhtml))	38s
ci (ubuntu-latest, typing)	15s
ci (ubuntu-latest, docs(man))	46s
ci (ubuntu-latest, style)	17s
ci (ubuntu-latest, docs(spelling))	43s
ci (ubuntu-latest, docs(linkcheck))	33s
ci (ubuntu-latest, secrets)	22s
ci (ubuntu-latest, docs(style))	31s
ci (ubuntu-latest, build)	23s
ci (ubuntu-latest, tests-3.13, coverage github)	16s
packaging	8s
	28m 7s

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