Upgrade Postgres JDBC driver to 42.7.8

Closes #2141

Author: schauder

pom.xml

@@ -38,7 +38,7 @@
 		<mariadb-java-client.version>3.4.2</mariadb-java-client.version>
 		<mssql.version>12.8.1.jre11</mssql.version>
 		<mysql-connector-java.version>8.0.33</mysql-connector-java.version>
-		<postgresql.version>42.7.5</postgresql.version>
+		<postgresql.version>42.7.8</postgresql.version>
 		<oracle.version>23.5.0.24.07</oracle.version>
 
 		<!-- R2DBC driver dependencies-->