Speed up PostgreSQL builds (#1650) #1368

Job	Run time
Run tests (ubuntu-latest, 8, MySQL-5.6, vertx-mysql-client)	2m 8s
Run tests (ubuntu-latest, 8, MSSQL-2017-latest, vertx-mssql-client)	1m 51s
Run tests (ubuntu-latest, 8, PostgreSQL-10, vertx-pg-client)	3m 48s
Run tests (ubuntu-latest, 8, vertx-sql-client-templates)	1m 29s
Run tests (ubuntu-latest, 25, PostgreSQL-11, vertx-pg-client)	3m 22s
Run tests (ubuntu-latest, 8, MySQL-5.7, vertx-mysql-client)	2m 11s
Run tests (ubuntu-latest, 8, DB2-11.5, vertx-db2-client)	13m 53s
Run tests (ubuntu-latest, 25, Oracle-23, vertx-oracle-client)	2m 2s
Run tests (ubuntu-latest, 25, MariaDB-10.4, vertx-mysql-client)	2m 4s
Run tests (ubuntu-latest, 8, MySQL-8.0, vertx-mysql-client)	2m 21s
Run tests (ubuntu-latest, 8, PostgreSQL-11, vertx-pg-client)	3m 34s
Run tests (ubuntu-latest, 25, MySQL-5.7, vertx-mysql-client)	2m 29s
Run tests (ubuntu-latest, 25, MSSQL-2019-latest, vertx-mssql-client)	1m 40s
Run tests (ubuntu-latest, 8, MSSQL-2019-latest, vertx-mssql-client)	1m 57s
Run tests (ubuntu-latest, 8, PostgreSQL-9, vertx-pg-client)	3m 48s
Run tests (ubuntu-latest, 8, MariaDB-10.4, vertx-mysql-client)	2m 18s
Deploy to OSSRH	-1s
	50m 54s

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