chore: change to a secure base image #8445

Job	Run time
build (11)	14m 37s
build(21) except self-service clients	13m 40s
build(8) except for gapic-generator-java	4m 20s
build (17)	14m 27s
build(8) for gapic-generator-java	11m 38s
compatibility	1m 34s
dependency_analyzer_unit_test	18s
gapic-generator-java-bom	1m 47s
lint	22s
showcase (11)	3m 59s
showcase (17)	3m 52s
showcase-clirr	3m 6s
showcase (21)	3m 53s
showcase-native	8m 9s
unmanaged_dependency_check	4m 45s
	1h 30m 27s

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