Add required for maven central publishing #1604

Job	Run time
build (oracle-plugin)	19m 15s
build (postgresql-plugin)	19m 15s
build (cloudsql-postgresql-plugin)	19m 15s
build (cloudsql-mysql-plugin)	19m 16s
build (mysql-plugin)	19m 16s
build (mssql-plugin)	19m 16s
	1h 55m 33s

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