Bump bazel-contrib/.github from 6 to 7 #220

Job	Run time
integration-tests (ubuntu-latest, true)	1m 57s
build (ubuntu-latest, true)	47s
integration-tests (ubuntu-latest, false)	1m 56s
build (ubuntu-latest, false)	1m 54s
integration-tests (windows-2022, true)	16s
build (windows-2022, true)	17s
integration-tests (windows-2022, false)	21s
build (windows-2022, false)	30s
integration-tests (macos-13, true)	3m 30s
build (macos-13, true)	2m 31s
integration-tests (macos-13, false)	5m 10s
build (macos-13, false)	2m 27s
	21m 36s

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