ci: move linter to ubuntu:24.04

- do not containerize the linter (for now) as all it does is a
  python3 check on translations.

Author: patricklodder

.github/workflows/linter.yml

@@ -10,7 +10,7 @@ on:
 jobs:
   translations:
     name: Check Translations
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     steps:
     - uses: actions/checkout@v4
     - name: Lint translation files