CI: Add Debian 13 to the FULL_OS runner list

[mcmilk]

This commit adds Debian 13 alias Trixie to the checked operating systems. The image needs to be run with UEFI support.

Current Debian version overview:

• Debian 11 (Bullseye) -> "oldoldstable"
• Debian 12 (Bookworm) -> "oldstable"
• Debian 13 (Trixie) -> new "stable"

The CI will be run on Debian 12 and Debian 13 now. Debian 11 is kept, but won't be used automatically.

Motivation and Context

Description

How Has This Been Tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Performance enhancement (non-breaking change which improves efficiency)
• Code cleanup (non-breaking change which makes code smaller or more readable)
• Quality assurance (non-breaking change which makes the code more robust against bugs)
• Breaking change (fix or feature that would cause existing functionality to change)
• Library ABI change (libzfs, libzfs_core, libnvpair, libuutil and libzfsbootenv)
• Documentation (a change to man pages or other documentation)

Checklist:

• My code follows the OpenZFS code style requirements.
• I have updated the documentation accordingly.
• I have read the contributing document.
• I have added tests to cover my changes.
• I have run the ZFS Test Suite with this change applied.
• All commit messages are properly formatted and contain Signed-off-by.

[mcmilk]

Sorry, seems not ready currently.