deps: update google auth library dependencies to v1.27.0 #8260

Job	Run time
build(21) except self-service clients	13m 50s
build (11)	15m 5s
build (17)	14m 50s
build(8) except for gapic-generator-java	4m 20s
build(8) for gapic-generator-java	11m 36s
compatibility	1m 32s
gapic-generator-java-bom	1m 49s
lint	30s
showcase (11)	4m 7s
showcase-clirr	3m 5s
showcase (17)	4m 2s
showcase-native	8m 11s
showcase (21)	4m 12s
unmanaged_dependency_check	7m 11s
dependency_analyzer_unit_test	17s
	1h 34m 37s

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