deps: update dependency filelock to v3.16.0 #7994

Job	Run time
build(21) except self-service clients	14m 11s
build (11)	15m 6s
build(8) except for gapic-generator-java	4m 13s
build (17)	15m 0s
build(8) for gapic-generator-java	12m 0s
compatibility	1m 30s
dependency_analyzer_unit_test	14s
gapic-generator-java-bom	2m 13s
lint	21s
showcase (11)	4m 11s
showcase (17)	4m 4s
showcase-clirr	3m 9s
showcase (21)	3m 58s
showcase-native	9m 17s
unmanaged_dependency_check	3m 56s
	1h 33m 23s

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