chore(main): release 2.42.0 #7256

Job	Run time
build (11)	12m 31s
build(8) except for gapic-generator-java	4m 4s
build (17)	12m 41s
build(21) except self-service clients	11m 42s
build(8) for gapic-generator-java	10m 12s
compatibility	2m 18s
lint	24s
dependency_analyzer_unit_test	18s
gapic-generator-java-bom	2m 16s
showcase (11)	4m 1s
showcase-clirr	2m 57s
showcase (17)	4m 29s
showcase-native	8m 19s
unmanaged_dependency_check	5m 56s
	1h 22m 8s

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