fix codeguard action ref to use @main branch

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

Author: m1el

.github/workflows/codeguard.yml

@@ -18,7 +18,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Run CodeGuard analysis
-        uses: DNYoussef/codeguard-action@v1
+        uses: DNYoussef/codeguard-action@main
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           risk_threshold: L3