ci: restore python to CodeQL matrix

Two Python scripts are tracked in the repo (scripts/convert_mitm_script.py,
scripts/patch-stockholm-bridge.py). The original GitHub-generated codeql.yml
included language:python; our adapted version dropped it unintentionally.

Restores parity with what GitHub auto-detected.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/workflows/codeql.yml

@@ -28,6 +28,8 @@ jobs:
             build-mode: autobuild
           - language: javascript-typescript
             build-mode: none
+          - language: python
+            build-mode: none
 
     steps:
       - name: Checkout repository