fix: vulnerability scan and report upload

Author: mrajagopal

.github/workflows/docker-build.yml

@@ -33,14 +33,14 @@ jobs:
 
   # Step 5: Install Trivy for Vulnerability Scanning
       - name: Install Trivy
-        uses: aquasecurity/trivy-action
+        uses: aquasecurity/trivy-action@0.28.0
         with:
           image-ref: ghcr.io/${{ github.repository_owner }}/nginx-utils:latest
           format: json
           output: vuln-report.json
 
       - name: Upload Vulnerability Report
-        uses: actions/upload-artifact
+        uses: actions/upload-artifact@4
         with:
           name: vuln-report
           path: vuln-report.json