Draft: Update debian/latest to MariaDB 10.9

Tuukka Pasanenrequested to merge
illuusio/mariadb-server:debian/latest-10.9 into debian/latest

Currently Debian debian/latest is based on MariaDB 10.6. This MR Drafts what is needed to upgrade it to MariaDB 10.9.3

It's not in anyway ready to merge and it's heavily on development.

Comments and suggestions are more than welcome in here or upstream JIRA MDEV-29437

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