cicd: Update alpha 3 vuln-diff-action #TASK-7908

Author: juanfeSanahuja

.github/workflows/compare-vulnerabilities.yml

@@ -50,7 +50,7 @@ jobs:
           cache: 'maven'
       # 3) Run the action
       - name: Vulnerability Diff (Syft+Grype)
-        uses: sec-open/vuln-diff-action@v2.0.0-alpha.1
+        uses: sec-open/vuln-diff-action@v2.0.0-alpha.3
         with:
           base_ref: ${{ github.event.inputs.branch_a }}   # pass 'develop'
           head_ref: ${{ github.event.inputs.branch_b }}   # pass 'TASK-7908'