deps: update googleapis/java-cloud-bom digest to 659764f #5672

Job	Run time
build (11)	12m 18s
build (17)	12m 14s
build(21) except self-service clients	11m 10s
build(8) except for gapic-generator-java	4m 0s
build(8) for gapic-generator-java	9m 36s
compatibility	1m 33s
lint	21s
showcase (11)	3m 31s
showcase (17)	3m 55s
gapic-generator-java-bom	1m 52s
showcase-clirr	3m 8s
showcase-native	7m 37s
unmanaged_dependency_check	4m 6s
	1h 15m 21s

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