HHH-14494 Upgrade the PostgreSQL JDBC driver used for testing to v. 42.2.19

Author: Sanne

databases/pgsql/matrix.gradle

@@ -4,4 +4,4 @@
  * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
  * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
  */
-jdbcDependency 'org.postgresql:postgresql:42.2.2'
+jdbcDependency 'org.postgresql:postgresql:42.2.19'