fix(ci): Align mariadb versions with list of supported versions

[susnux]

Summary

We currently support 10.3, 10.5, 10.6 (old LTS) and 10.11 (current LTS) so we can drop 10.4 from CI and save a bit of CI time.

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[nickvergessen]

Also in .github?

[susnux]

Also in .github?

The templates only check for LTS version 10.6 and 10.11 (and in few weeks probably 11.4)

[solracsf]

Why have dropped 10.4 and not 10.3 (which is EOL) ?
https://endoflife.date/mariadb

[nickvergessen]

Sounds like a mistake. I think someone mentioned .3 to be an LTS, but .4 actually is the LTS

[susnux]

No 10.3 is supported because of Ubuntu 20.04 shipping it and we support Ubuntu 20.04

10.4 was dropped on purpose as it is only a short term stable and will be eol when Nextcloud 30 is released

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