Bump actions/checkout from 5 to 6 #5809

Job	Run time
upload-event-file	3s
build-for-e2e-test (ubuntu-latest)	2m 33s
build-for-e2e-test (windows-latest)	2m 39s
build-for-e2e-test (macos-latest)	1m 43s
build (windows-latest, actions)	14m 18s
build (ubuntu-latest, actions)	13m 13s
build (windows-latest, csharp)	13m 27s
build (macos-latest, csharp)	11m 56s
build (ubuntu-latest, csharp)	14m 57s
build (macos-latest, actions)	12m 27s
e2e-test (macos-latest, Ghes)	5s
e2e-test (ubuntu-latest, AdoBasic)	5s
e2e-test (windows-latest, Bbs)	4s
e2e-test (macos-latest, AdoCsv)	5s
e2e-test (windows-latest, Github)	5s
e2e-test (windows-latest, Ghes)	5s
e2e-test (ubuntu-latest, Ghes)	5s
e2e-test (ubuntu-latest, AdoCsv)	5s
e2e-test (windows-latest, AdoCsv)	5s
e2e-test (windows-latest, AdoBasic)	5s
e2e-test (macos-latest, Bbs)	5s
e2e-test (macos-latest, AdoBasic)	5s
e2e-test (ubuntu-latest, Bbs)	4s
e2e-test (macos-latest, Github)	5s
e2e-test (ubuntu-latest, Github)	5s
publish	-1s
	1h 28m 28s

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