Revert "Revert "Revert "Disable dependabot update for Github Actions""" #2005

Job	Run time
test (1.37)	1m 25s
test (stable)	34s
test (beta)	33s
test (nightly)	1m 27s
deny / deny	12s
check-external-types / check-external-types	22s
docs / docs	12s
miri / miri	45s
msrv / msrv	5m 9s
tidy / tidy	53s
	11m 32s

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