Update CodeQL Action to v4 in anticipation of v3 deprecation.

CodeQL Action v3 will be deprecated in December 2026. Please update all occurrences of the CodeQL Action in your workflow files to v4. For more information, see https://github.blog/changelog/2025-10-28-upcoming-deprecation-of-codeql-action-v3/

Author: lemmy

.github/workflows/main.yml

@@ -82,7 +82,7 @@ jobs:
               --summary-output reports/execution-summary.json
       - name: Upload SARIF report
         if: always()
-        uses: github/codeql-action/upload-sarif@v3
+        uses: github/codeql-action/upload-sarif@v4
         with:
           sarif_file: reports/validation.sarif
           category: tlc-validation