[Misc] Force the docker image releaser to update the JDBC driver versions (so that they're up to date)

* Added missing postgresql docker tag version update for some configs

* Update README + fix postgresql docker tag version

+ upgrade the MYSQL JDBC driver to version 8.0.28

[Misc] Use a better (more specific) tomcat image tag so that if tomcat changes the jdk version for tag "9", we won't be affected

* Add TOC entry

* After template execution

[Misc] Remove my name and email now that the module is in the XWiki GitHub Organization and this maintained by the XWiki Committers