deps: update googleapis/java-cloud-bom digest to db4265f #6636

Job	Run time
build(21) except self-service clients	11m 12s
build (11)	12m 17s
build (17)	12m 9s
build(8) except for gapic-generator-java	4m 4s
build(8) for gapic-generator-java	9m 23s
compatibility	1m 25s
lint	22s
showcase-native	3m 15s
dependency_analyzer_unit_test	25s
gapic-generator-java-bom	1m 45s
showcase (11)	3m 57s
showcase-clirr	2m 54s
showcase (17)	4m 0s
unmanaged_dependency_check	3m 35s
	1h 10m 43s

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