Add support for Debian 13 (trixie)

[mika]

Summary

Debian v13 AKA trixie was released on 2025-08-09 as Debian's new stable release.

Additional Context

Based on commit 00c7eb14802f1658a24d842d8f8b9717ca2b7f5b for Debian 12 support

Checklist

• [ ] 🟢 Spec tests.
• [ ] 🟢 Acceptance tests.
• [x] Manually verified. (we're using this $internally)