Upgrade Postgres JDBC driver to 42.7.8

Closes #2141

Author: schauder

pom.xml

@@ -38,7 +38,7 @@
 		<mariadb-java-client.version>3.5.5</mariadb-java-client.version>
 		<mssql.version>13.1.1.jre11-preview</mssql.version>
 		<mysql-connector-java.version>9.4.0</mysql-connector-java.version>
-		<postgresql.version>42.7.7</postgresql.version>
+		<postgresql.version>42.7.8</postgresql.version>
 		<oracle.version>23.9.0.25.07</oracle.version>
 
 		<!-- R2DBC driver dependencies-->