[not for review yet] deps: changing jsr305 to jspecify #8163

Job	Run time
build (11)	14m 54s
build (17)	14m 39s
build(21) except self-service clients	14m 3s
build(8) except for gapic-generator-java	4m 11s
build(8) for gapic-generator-java	11m 39s
compatibility	1m 35s
dependency_analyzer_unit_test	14s
gapic-generator-java-bom	1m 43s
lint	28s
showcase-clirr	3m 0s
showcase (11)	4m 28s
showcase (17)	4m 13s
showcase-native	7m 58s
showcase (21)	4m 5s
unmanaged_dependency_check	4m 53s
	1h 32m 3s

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