Bump actions/checkout from 6.0.3 to 7.0.0 in the github-actions group #35775

Job	Run time
lint	59s
package-size	1m 33s
knip	30s
misc	26s
baselines	8m 56s
smoke	56s
format	25s
coverage	11m 23s
Test Node 24 on windows-latest	8m 36s
Test Node 24 on ubuntu-latest	8m 25s
Test Node 14 on ubuntu-latest	12m 4s
Test Node 14 on windows-latest	14m 8s
Test Node lts/* on ubuntu-latest with --no-bundle	11m 25s
self-check	51s
typecheck	49s
required	3s
	1h 21m 29s

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