fix(deps): update zipkin-gcp.version to v2.2.6 (#3453) #2630

Job	Run time
parallel-NativeTests (alloydb-sample)	7m 7s
parallel-NativeTests (bigquery-sample)	12m 27s
parallel-NativeTests (bigquery)	12m 34s
parallel-NativeTests (core)	9m 37s
parallel-NativeTests (data-firestore)	12m 10s
parallel-NativeTests (data-firestore-sample)	12m 32s
parallel-NativeTests (datastore)	11m 29s
parallel-NativeTests (datastore-basic-sample)	11m 39s
parallel-NativeTests (kms)	11m 29s
parallel-NativeTests (kms-sample)	12m 27s
parallel-NativeTests (logging-sample)	13m 18s
parallel-NativeTests (metrics-sample)	14m 42s
parallel-NativeTests (pubsub-sample)	19m 47s
parallel-NativeTests (pubsub-bus-sample)	10m 46s
parallel-NativeTests (pubsub-integration-sample)	39m 40s
parallel-NativeTests (secretmanager)	11m 41s
parallel-NativeTests (secretmanager-sample)	12m 47s
parallel-NativeTests (spanner)	25m 41s
parallel-NativeTests (sql-mysql-sample)	11m 21s
parallel-NativeTests (sql-postgres-sample)	15m 34s
parallel-NativeTests (starter-firestore-sample)	11m 20s
parallel-NativeTests (storage)	11m 27s
parallel-NativeTests (storage-sample)	15m 52s
parallel-NativeTests (trace-sample)	14m 26s
parallel-NativeTests (vision)	13m 20s
parallel-NativeTests (vision-sample)	13m 29s
	6h 8m 42s

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