mariadb: upgrade default from 10.11 to 11.4

- `nodePackages.rimraf` has been removed, as it is a Javascript library, and packages that want to use it should depend directly on it instead.

- `mariadb` now defaults to `mariadb_114` instead of `mariadb_1011`, meaning the default version was upgraded from 10.11.x to 11.4.x. See the [upgrade notes](https://mariadb.com/kb/en/upgrading-from-mariadb-10-11-to-mariadb-11-4/) for potential issues.

## Other Notable Changes {#sec-nixpkgs-release-25.11-notable-changes}

<!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. -->

    mariadb_114

    mariadb_118

    ;

  mariadb = mariadb_1011;

  mariadb = mariadb_114;

  mariadb-embedded = mariadb.override { withEmbedded = true; };

  mongodb = hiPrio mongodb-7_0;