Upgrade DB2 JDBC driver version to 11.5.7.0.
Closes
<!-- databases and jdbc drivers -->
<!-- note that these currently do not control the versions of databases used via Testcontainers for testing -->
- <db2.version>11.5.5.0</db2.version>
+ <db2.version>11.5.7.0</db2.version>
<h2.version>1.4.200</h2.version>
<hsqldb.version>2.5.2</hsqldb.version>
<mariadb-java-client.version>2.7.2</mariadb-java-client.version>
