Revert "[#1791] Upgrade Vert.x SQL client to 4.5.0" #14

Job	Run time
Run examples in 'session-example' on MySQL with latest ORM [6.2,6.3)	1m 36s
Test with MariaDB and ORM [6.2,6.3)	2m 16s
Run examples in 'session-example' on PostgreSQL with latest ORM [6.2,6.3)	1m 41s
Test with MySQL and ORM [6.2,6.3)	2m 29s
Run examples in 'native-sql-example' on PostgreSQL with latest ORM [6.2,6.3)	1m 36s
Test with PostgreSQL and ORM [6.2,6.3)	2m 8s
Test with DB2 and ORM [6.2,6.3)	2m 33s
Test with CockroachDB and ORM [6.2,6.3)	4m 12s
Test with MSSQLServer and ORM [6.2,6.3)	2m 31s
Test with Oracle and ORM [6.2,6.3)	2m 27s
	23m 29s

Provide feedback