In debian/control file there is several mariadb-*-10.9 Conflicts
or Replaces that which are not neede on MariaDB 10.9 anymore
as there is not suffix anymore.

Package libmariadbclient-dev is part of Ubuntu and it's
not build with official package so there can't be
variable: '${source:Version}' which is used with packages
that are part of package.

NOTE TO MERGER: This is only up-to MariaDB 10.10.