deps: update dependency com.google.api-client:google-api-client-bom to v2.7.0 #7900

Job	Run time
build (11)	15m 3s
build (11)	15m 3s
build (11)	15m 3s
build (17)	15m 4s
build (17)	15m 4s
build (17)	15m 4s
build(21) except self-service clients	13m 38s
build(21) except self-service clients	13m 38s
build(21) except self-service clients	13m 38s
build(8) except for gapic-generator-java	5m 6s
build(8) except for gapic-generator-java	5m 6s
build(8) except for gapic-generator-java	5m 6s
build(8) for gapic-generator-java	11m 30s
build(8) for gapic-generator-java	11m 30s
build(8) for gapic-generator-java	11m 30s
compatibility	1m 49s
compatibility	1m 49s
compatibility	1m 49s
lint	32s
lint	32s
lint	32s
dependency_analyzer_unit_test	13s
dependency_analyzer_unit_test	13s
dependency_analyzer_unit_test	13s
gapic-generator-java-bom	1m 51s
gapic-generator-java-bom	1m 51s
gapic-generator-java-bom	1m 51s
showcase (11)	3m 58s
showcase (11)	3m 58s
showcase (11)	3m 58s
showcase-clirr	3m 5s
showcase-clirr	3m 12s
showcase-clirr	3m 12s
showcase (17)	3m 49s
showcase (17)	3m 49s
showcase (17)	3m 49s
showcase (21)	4m 0s
showcase (21)	4m 0s
showcase (21)	4m 0s
showcase-native	8m 7s
showcase-native	8m 7s
showcase-native	8m 7s
unmanaged_dependency_check	4m 51s
unmanaged_dependency_check	4m 51s
unmanaged_dependency_check	4m 21s
	4h 37m 32s

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