Upgrade DB2 JDBC driver to 12.1.0.0

Closes #1988

Author: schauder

pom.xml

@@ -32,7 +32,7 @@
 
 		<!-- databases and jdbc drivers -->
 		<!-- note that these currently do not control the versions of databases used via Testcontainers for testing -->
-		<db2.version>11.5.9.0</db2.version>
+		<db2.version>12.1.0.0</db2.version>
 		<h2.version>2.3.232</h2.version>
 		<hikari.version>5.1.0</hikari.version>
 		<hsqldb.version>2.7.3</hsqldb.version>