Upgrade to MariaDB 3.5.6 and DB2 12.1.3.0 drivers.

Closes #2194

pom.xml

@@ -31,7 +31,7 @@
 
 		<!-- databases and jdbc drivers -->
 		<!-- note that these currently do not control the versions of databases used via Testcontainers for testing -->
-		<db2.version>12.1.2.0</db2.version>
+		<db2.version>12.1.3.0</db2.version>
 		<h2.version>2.4.240</h2.version>
 		<hikari.version>5.1.0</hikari.version>
 		<hsqldb.version>2.7.3</hsqldb.version>