Upgrade DB2 Docker image to 11.5.7.0a.

Closes #1272

ci/accept-third-party-license.sh

@@ -2,5 +2,5 @@
 
 {
   echo "mcr.microsoft.com/mssql/server:2017-CU12"
-  echo "ibmcom/db2:11.5.0.0a"
+  echo "ibmcom/db2:11.5.7.0a"
 } > spring-data-jdbc/src/test/resources/container-license-acceptance.txt

spring-data-jdbc/src/test/java/org/springframework/data/jdbc/testing/Db2DataSourceConfiguration.java

@@ -37,6 +37,7 @@ import org.testcontainers.containers.Db2Container;
 @Profile("db2")
 class Db2DataSourceConfiguration extends DataSourceConfiguration {
 
+	public static final String DOCKER_IMAGE_NAME = "ibmcom/db2:11.5.7.0a";
 	private static final Log LOG = LogFactory.getLog(Db2DataSourceConfiguration.class);
 
 	private static Db2Container DB_2_CONTAINER;
@@ -47,7 +48,7 @@ class Db2DataSourceConfiguration extends DataSourceConfiguration {
 		if (DB_2_CONTAINER == null) {
 
 			LOG.info("DB2 starting...");
-			Db2Container container = new Db2Container().withReuse(true);
+			Db2Container container = new Db2Container(DOCKER_IMAGE_NAME).withReuse(true);
 			container.start();
 			LOG.info("DB2 started");
 

spring-data-jdbc/src/test/java/org/springframework/data/jdbc/testing/LicenseListener.java

@@ -43,7 +43,7 @@ public class LicenseListener implements TestExecutionListener {
 		environment = new StandardEnvironment();
 
 		if (environment.acceptsProfiles(Profiles.of("db2"))) {
-			assumeLicenseAccepted(Db2Container.DEFAULT_DB2_IMAGE_NAME + ":" + Db2Container.DEFAULT_TAG);
+			assumeLicenseAccepted(Db2DataSourceConfiguration.DOCKER_IMAGE_NAME);
 		}
 
 		if (environment.acceptsProfiles(Profiles.of("mssql"))) {