chore: change to a secure base image #8440

Job	Run time
build (11)	14m 37s
build(21) except self-service clients	13m 22s
build (17)	15m 42s
build(8) for gapic-generator-java	11m 19s
build(8) except for gapic-generator-java	4m 27s
compatibility	1m 31s
gapic-generator-java-bom	1m 47s
showcase (11)	4m 2s
lint	22s
showcase (17)	4m 9s
showcase (21)	4m 1s
showcase-clirr	3m 3s
showcase-native	7m 53s
unmanaged_dependency_check	4m 25s
dependency_analyzer_unit_test	15s
	1h 30m 55s

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