Migrate to latest pkg:google_cloud apis #61

Job	Run time
health / leaking / run leaking health check	49s
health / breaking / run breaking health check	1m 8s
health / license / run license health check	52s
health / changelog / run changelog health check	53s
health / do-not-submit / run do-not-submit health check	48s
health / unused-dependencies / run unused-dependencies health check	48s
health / coverage	-1s
health / comment	9s
	5m 26s

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