deps: update googleapis/java-cloud-bom digest to 47c5dbc #7342

Job	Run time
build(8) except for gapic-generator-java	4m 52s
build (11)	12m 54s
build (17)	12m 41s
build(21) except self-service clients	11m 40s
build(8) for gapic-generator-java	9m 52s
lint	24s
compatibility	1m 38s
dependency_analyzer_unit_test	21s
gapic-generator-java-bom	1m 53s
showcase (11)	3m 57s
showcase (17)	4m 4s
showcase-clirr	3m 13s
showcase-native	8m 36s
unmanaged_dependency_check	4m 16s
	1h 20m 21s

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