Update mariadb
Update mariadb

Changes:

- https://github.com/docker-library/mariadb/commit/9ddcc2b: Update to 1:10.3.21+maria~bionic
- https://github.com/docker-library/mariadb/commit/f03a74b: Update to 1:10.2.30+maria~bionic
- https://github.com/docker-library/mariadb/commit/2345e98: Update to 1:10.4.11+maria~bionic

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