Bump google.golang.org/api from 0.203.0 to 0.204.0 in /gcp #315

Job	Run time
Test (stable)	24s
Test (oldstable)	35s
Test (otlp, stable)	40s
Test (otlp, oldstable)	53s
Test (gcp, stable)	57s
Test (gcp, oldstable)	1m 2s
Test (grpc, stable)	53s
Test (grpc, oldstable)	55s
Test (examples/grpc, stable)	1m 9s
Test (examples/grpc, oldstable)	1m 2s
Test (http, stable)	47s
Test (http, oldstable)	51s
Test (examples/http, stable)	1m 7s
Test (examples/http, oldstable)	56s
All Tests	1s
	12m 12s

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