deps: update googleapis/java-cloud-bom digest to db4265f #6681

Job	Run time
build(21) except self-service clients	11m 22s
build(8) except for gapic-generator-java	3m 56s
build (11)	12m 21s
build (17)	15m 57s
build(8) for gapic-generator-java	11m 0s
lint	23s
compatibility	1m 39s
dependency_analyzer_unit_test	11s
gapic-generator-java-bom	1m 40s
showcase (11)	4m 8s
showcase (17)	4m 8s
showcase-clirr	3m 19s
showcase-native	8m 22s
unmanaged_dependency_check	3m 51s
	1h 22m 17s

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