Bump aquasecurity/trivy-action from 0.20.0 to 0.28.0

Bumps [aquasecurity/trivy-action](https://github.com/aquasecurity/trivy-action) from 0.20.0 to 0.28.0.
- [Release notes](https://github.com/aquasecurity/trivy-action/releases)
- [Commits](aquasecurity/trivy-action@0.20.0...0.28.0)

---
updated-dependencies:
- dependency-name: aquasecurity/trivy-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/auto-pr-ci.yaml

@@ -65,7 +65,7 @@ jobs:
           path: "playbooks/"
 
       - name: Run Trivy vulnerability scanner in fs mode
-        uses: aquasecurity/trivy-action@0.20.0
+        uses: aquasecurity/trivy-action@0.28.0
         with:
           scan-type: 'fs'
           scan-ref: '.'