change the trivy action from v0.28.0 to 0.28.0

Author: Isabella Monstwillo

.github/workflows/trivy.yml

@@ -25,7 +25,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Run Trivy vulnerability scanner
-        uses: aquasecurity/trivy-action@v0.28.0
+        uses: aquasecurity/trivy-action@0.28.0
         with:
           scan-type: image-ref
           image-ref: alpine:3.20