deps: update dependency watchdog to v4.0.2 #8318

Job	Run time
build (11)	14m 54s
build(21) except self-service clients	14m 7s
build(8) except for gapic-generator-java	4m 25s
build (17)	14m 22s
build(8) for gapic-generator-java	12m 3s
compatibility	1m 35s
dependency_analyzer_unit_test	18s
gapic-generator-java-bom	2m 7s
lint	33s
showcase (11)	4m 9s
showcase-clirr	3m 12s
showcase-native	8m 29s
showcase (17)	4m 2s
showcase (21)	4m 13s
unmanaged_dependency_check	4m 13s
	1h 32m 42s

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