deps: update dependency filelock to v3.16.1 #8185

Job	Run time
build(21) except self-service clients	13m 43s
build (11)	15m 7s
build(8) except for gapic-generator-java	4m 16s
build (17)	15m 19s
build(8) for gapic-generator-java	11m 38s
compatibility	1m 29s
dependency_analyzer_unit_test	13s
gapic-generator-java-bom	1m 50s
lint	30s
showcase (11)	4m 13s
showcase (17)	4m 1s
showcase-clirr	2m 57s
showcase (21)	4m 0s
showcase-native	7m 54s
unmanaged_dependency_check	5m 18s
	1h 32m 28s

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