XDOCKER-225: Allow customizing the JDBC connexion parameters + add "allowPublicKeyRetrieval=true" by default for MySQL
XDOCKER-285: Change default MySQL/MariaDB charset + collation to utf8mb4

* no need to generate and set the validation and encryption keys anymore

[Misc] Upgrade PostgreSQL version to 16 (latest stable) in our documentation + docker compose example

[Misc] Upgrade MariaDB version to 11.1 (latest stable) in our documentation + docker compose example

* fix MySQL connector download URL

* Go back to 9-jre11 (will document a workaround for users hitting the problem)

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

* 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

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

* Revert the MySQL upgrade because of issues for 12.10.x and 13.2.x branches

* Also update the MySQL driver from 8.0.22 to 8.0.23

* Verify the MySQL driver download to avoid man in the middle attacks

* Fix bug

* Added comment

XDOCKER-131: docker-entrypoint doen't set database

  * Missing update of docker-compose so that the build don't put back
    12.1-alpine