removing Snapshot for hub release #1516

Job	Run time
build (postgresql-plugin)	36m 34s
build (cloudsql-postgresql-plugin)	10m 36s
build (mssql-plugin)	1h 20m 45s
build (mysql-plugin)	1h 22m 38s
build (oracle-plugin)	2h 6m 38s
build (cloudsql-mysql-plugin)	1h 20m 8s
	6h 57m 19s

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