Bumped to 2.13.1-SNAPSHOT #1369

Job	Run time
build (mysql-plugin)	1h 17m 28s
build (oracle-plugin)	12m 22s
build (postgresql-plugin)	31m 50s
build (cloudsql-postgresql-plugin)	5m 53s
build (cloudsql-mysql-plugin)	1h 15m 5s
build (mssql-plugin)	1h 16m 21s
	4h 38m 59s

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