ci: move linter codeql to ubuntu:24.04

- containerize the linter, use 24.04 for the translation checker,
  as all that needs is python
- do not containerize codeql but anyway run it on ubuntu:24.04, as
  static analysis should not care about the underlying OS and for
  analysis newer is better.
- fixes the branches codeql is called on

Author: patricklodder

.github/workflows/codeql-analysis.yml

@@ -21,7 +21,7 @@ on:
 jobs:
   analyze:
     name: Analyze
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     permissions:
       actions: read
       contents: read

.github/workflows/linter.yml

@@ -10,8 +10,12 @@ on:
 jobs:
   translations:
     name: Check Translations
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
+    container: ubuntu:24.04
     steps:
     - uses: actions/checkout@v4
     - name: Lint translation files
-      run: python3 contrib/devtools/check-translations.py
+      run: |
+        apt-get update
+        apt-get install -y python3
+        python3 contrib/devtools/check-translations.py