deps: Use Gapic-Showcase v0.35.1 #7343

Job	Run time
build (11)	12m 45s
build(21) except self-service clients	11m 30s
build (17)	12m 39s
build(8) except for gapic-generator-java	4m 17s
build(8) for gapic-generator-java	10m 16s
compatibility	1m 51s
dependency_analyzer_unit_test	18s
gapic-generator-java-bom	1m 54s
lint	29s
showcase (11)	4m 4s
showcase (17)	4m 8s
showcase-clirr	3m 3s
showcase-native	8m 12s
unmanaged_dependency_check	6m 57s
	1h 22m 23s

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