deps: update dependencies.txt for grpc-gcp to 1.9.0 #7955

Job	Run time
downstream-compatibility-spring-generator	10m 41s
downstream-compatibility (java-spanner-jdbc)	3m 22s
downstream-compatibility (java-storage-nio)	2m 44s
downstream-compatibility (java-bigtable)	6m 7s
downstream-compatibility (java-datastore)	3m 35s
downstream-compatibility (java-spanner)	5m 18s
downstream-compatibility (java-storage)	4m 33s
downstream-compatibility (java-bigquerystorage)	10m 18s
downstream-compatibility (java-pubsublite)	2m 29s
downstream-compatibility (java-logging)	2m 6s
downstream-compatibility (java-firestore)	2m 39s
downstream-compatibility (java-bigquery)	4m 45s
downstream-compatibility (google-cloud-java)	14m 38s
downstream-compatibility (java-pubsub)	6h 0m 15s
downstream-compatibility (java-logging-logback)	1m 58s
	7h 15m 28s

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