Implement Fixes for Debian 13

[dorianim]

Description

This PR implements some fixes to make linuxclient compatible with Debian 13.

See also:

• https://ask.linuxmuster.net/t/client-auf-basis-von-debian-13/11817/90?u=dorian
• Debian 13 (Trixie) Compatibility Changes for linuxmuster-linuxclient7 #83

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Plugin (a new plugin or an updated version of an existing plugin)
  • I agree to the developer guidelines for plugins
  • I will provide support and updates for this plugin
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Fresh Debian 13 setup
• Debian 13 with broken caps of krb5_child
• Cloned Debian 13
• Pop!OS
• Cloned Pop!OS

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules