Change mongo image in test container to v4.2.0

Author: Jonopono123

service/src/intTest/java/uk/nhs/adaptors/gp2gp/testcontainers/MongoDbContainer.java

@@ -7,7 +7,7 @@
 @Slf4j
 public final class MongoDbContainer extends GenericContainer<MongoDbContainer> {
     public static final int MONGODB_PORT = 27017;
-    public static final String DEFAULT_IMAGE_AND_TAG = "mongo:4.0.28";
+    public static final String DEFAULT_IMAGE_AND_TAG = "mongo:4.2.0";
     private static MongoDbContainer container;
 
     private MongoDbContainer() {