Remove redundant advanced CodeQL workflow (#24)

* Remove redundant advanced CodeQL workflow

The repo has CodeQL default setup enabled (python + actions, weekly),
which rejects SARIF uploads from advanced-config workflows. The legacy
codeql-analysis.yml therefore failed at the upload-processing step on
every scheduled run with:

  "CodeQL analyses from advanced configurations cannot be processed
   when the default setup is enabled"

Default setup already covers the same languages and query suite, so the
advanced workflow is pure redundancy. Removing it resolves the failing
runs (and drops the deprecated checkout@v3 / codeql-action@v2 actions).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* Ignore macOS .DS_Store files

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: jonaslejon

.github/workflows/codeql-analysis.yml

@@ -145,3 +145,6 @@ dmypy.json
 
 # Cython debug symbols
 cython_debug/
+
+# macOS
+.DS_Store