deps: update repo-automation-bots digest to 8b7d94b #9544

Job	Run time
build(21) except self-service clients	13m 5s
build (11)	14m 27s
build(8) except for gapic-generator-java	4m 13s
build (17)	14m 33s
build(8) for gapic-generator-java	11m 38s
lint	26s
compatibility	1m 34s
dependency_analyzer_unit_test	18s
gapic-generator-java-bom	1m 54s
showcase (11)	4m 25s
showcase-clirr	3m 8s
showcase (17)	4m 28s
showcase-native	8m 36s
showcase (21)	4m 28s
unmanaged_dependency_check	3m 54s
	1h 31m 7s

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