deps: update repo-automation-bots digest to 8b7d94b #9558

Job	Run time
build (11)	14m 52s
build(21) except self-service clients	13m 34s
build (17)	14m 16s
build(8) except for gapic-generator-java	4m 23s
build(8) for gapic-generator-java	11m 35s
compatibility	1m 34s
dependency_analyzer_unit_test	12s
gapic-generator-java-bom	1m 52s
lint	25s
showcase (11)	4m 19s
showcase-clirr	3m 4s
showcase-native	8m 49s
showcase (17)	4m 27s
unmanaged_dependency_check	3m 51s
showcase (21)	4m 17s
	1h 31m 30s

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