fix(ci): use trivy-action v0.31.0 (v0.32.0 does not exist)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: hi-lei

.github/workflows/security.yml

@@ -62,7 +62,7 @@ jobs:
         uses: actions/checkout@v6
 
       - name: Run trivy filesystem scan
-        uses: aquasecurity/trivy-action@0.32.0
+        uses: aquasecurity/trivy-action@0.31.0
         with:
           scan-type: "fs"
           scan-ref: "."