[not for review yet] deps: changing jsr305 to jspecify #8609

Job	Run time
build(21) except self-service clients	13m 58s
build(8) except for gapic-generator-java	4m 53s
build(8) for gapic-generator-java	11m 42s
build (11)	14m 47s
build (17)	15m 5s
compatibility	1m 28s
dependency_analyzer_unit_test	15s
gapic-generator-java-bom	1m 42s
lint	26s
showcase (11)	3m 59s
showcase (17)	3m 56s
showcase (21)	3m 56s
showcase-clirr	2m 56s
showcase-native	7m 59s
unmanaged_dependency_check	3m 58s
	1h 31m 0s

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