chore(main): release 2.45.0 #8032

Job	Run time
build (11)	15m 4s
build (17)	14m 50s
build(21) except self-service clients	14m 3s
build(8) except for gapic-generator-java	4m 15s
build(8) for gapic-generator-java	12m 14s
compatibility	1m 32s
lint	22s
dependency_analyzer_unit_test	12s
gapic-generator-java-bom	1m 43s
showcase (11)	4m 2s
showcase-clirr	2m 44s
showcase (17)	4m 1s
showcase-native	8m 26s
showcase (21)	3m 48s
unmanaged_dependency_check	4m 24s
	1h 31m 40s

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