Bump actions/checkout from 5 to 6 #981

Job	Run time
list	7s
ci (macos-latest, tests-pypy3.10)	1m 24s
ci (macos-latest, audit)	1m 12s
ci (macos-latest, tests-3.10)	1m 4s
ci (macos-latest, tests-3.11)	1m 15s
ci (macos-latest, docs(doctest))	1m 39s
ci (macos-latest, tests-3.12)	1m 3s
ci (macos-latest, typing)	58s
ci (macos-latest, secrets)	1m 15s
ci (macos-latest, tests-3.13)	56s
ci (macos-latest, docs(dirhtml))	1m 40s
ci (macos-latest, docs(spelling))	1m 44s
ci (macos-latest, docs(man))	1m 45s
ci (macos-latest, docs(linkcheck))	1m 35s
ci (macos-latest, style)	59s
ci (ubuntu-latest, build)	21s
ci (ubuntu-latest, docs(dirhtml))	42s
ci (ubuntu-latest, tests-3.12)	20s
ci (ubuntu-latest, audit)	20s
ci (ubuntu-latest, tests-3.13)	15s
ci (ubuntu-latest, tests-3.11)	14s
ci (ubuntu-latest, typing)	21s
ci (macos-latest, build)	1m 20s
ci (ubuntu-latest, tests-pypy3.10)	25s
ci (ubuntu-latest, docs(linkcheck))	33s
ci (ubuntu-latest, docs(doctest))	38s
ci (ubuntu-latest, docs(spelling))	45s
ci (macos-latest, docs(style))	1m 14s
ci (ubuntu-latest, docs(style))	29s
ci (ubuntu-latest, tests-3.10)	26s
ci (ubuntu-latest, docs(man))	51s
ci (ubuntu-latest, secrets)	20s
ci (ubuntu-latest, tests-3.13, coverage github)	21s
ci (ubuntu-latest, style)	19s
packaging	8s
	28m 58s

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