Update IBM DB2 image to 12.1.0.0

pom.xml

@@ -291,7 +291,7 @@
                                 <mssql.image>mcr.microsoft.com/mssql/rhel/server:2022-latest</mssql.image>
                                 <!-- Oracle image - we aim to use same version as Dev Services for Oracle so that we only download one image -->
                                 <oracle.image>docker.io/gvenzl/oracle-free:23-slim-faststart</oracle.image>
-                                <db2.image>docker.io/ibmcom/db2:11.5.8.0</db2.image>
+                                <db2.image>icr.io/db2_community/db2:12.1.0.0</db2.image>
                                 <mongodb.image>docker.io/library/mongo:7.0</mongodb.image>
                                 <redis.image>docker.io/library/redis:7.2</redis.image>
                                 <wiremock.image>docker.io/wiremock/wiremock:3.3.1</wiremock.image>