Update mariadb
Update mariadb

Changes:

- https://github.com/docker-library/mariadb/commit/9787916: Use explicit "hkps" for keys.openpgp.org
- https://github.com/docker-library/mariadb/commit/ee57f77: Switch from ha.pool.sks-keyservers.net to keys.openpgp.org for fetching Tianon's PGP key

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