Publish the Dockerfiles for the new release

Note: the official Dockerfiles fetch the binary distribution of the target Flink version from an Apache mirror. After publishing the binary release artifacts, mirrors can take some hours to start serving the new artifacts, so you may want to wait to do this step until you are ready to continue with the "Promote the release" steps in the follow-up Jira.

Follow the release instructions in the flink-docker repo to build the new Dockerfiles and send an updated manifest to Docker Hub so the new images are built and published.

Expectations

 * Dockerfiles in flink-docker updated for the new Flink release and pull request opened on the Docker official-images with an updated manifest