Remove superficial aarch64 config for mongo

* Since library/mongodb is multiarch image, pinning it to tag is not
  needed or useful - this way we won't get fixes for Mongo container. So
  this commit removes the tag.

pom.xml

@@ -819,8 +819,6 @@
                                         <amqbroker.image>registry.redhat.io/amq7/amq-broker-rhel8:7.12</amqbroker.image>
                                         <amq-streams.image>registry.redhat.io/amq-streams/kafka-35-rhel8</amq-streams.image>
                                         <amq-streams.version>2.6.0</amq-streams.version>
-                                        <!-- run 'docker manifest inspect mongo:5.0' and use digest for architecture 'arm64', variant '8', os 'linux' -->
-                                        <mongodb.image>docker.io/library/mongo@sha256:6f851e31a1b317c6fa681b7dad5f94c622f1c3588477f3b769579dc5462ee659</mongodb.image>
                                     </systemPropertyVariables>
                                     <rerunFailingTestsCount>${oc.reruns}</rerunFailingTestsCount>
                                 </configuration>