MT#60815 lib/set_debian_info: support Debian/trixie

Currently it's Debian/testing with trixie/sid yet, though to not fail
with templates handling, let's add initial support for it.

Addresses:

| 2024-09-17 14:17:07 spce: Error: Cannot process template '/etc/ngcp-config/templates/etc/apt/sources.list.d/debian.list.tt2':
|   undef error - Error: unsupported Debian codename trixie at (eval 16) line 31.
|
| 2024-09-17 14:17:07 spce: Error: Generating /etc/apt/sources.list.d/debian.list based on /etc/ngcp-config/templates/etc/apt/sources.list.d/debian.list.tt2: FAILED

Change-Id: Ib31bfec1373c51b3faeacc41a085b7229bff139e

lib/set_debian_info

@@ -26,6 +26,7 @@
     10 => 'buster',
     11 => 'bullseye',
     12 => 'bookworm',
+    13 => 'trixie',
   );
   my %codenames = map { $versions{$_} => $_ } keys %versions;