build(deps): bump aquasecurity/trivy-action from 0.24.0 to 0.28.0 (#6934)

Bumps [aquasecurity/trivy-action](https://github.com/aquasecurity/trivy-action) from 0.24.0 to 0.28.0.
- [Release notes](https://github.com/aquasecurity/trivy-action/releases)
- [Commits](6e7b7d1fd3...915b19bbe7)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/trivy-scan.yaml

@@ -20,7 +20,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871  # v4.2.1
       - name: Run Trivy vulnerability scanner
-        uses: aquasecurity/trivy-action@6e7b7d1fd3e4fef0c5fa8cce1229c54b2c9bd0d8  # master
+        uses: aquasecurity/trivy-action@915b19bbe73b92a6cf82a1bc12b087c9a19a5fe2  # master
         with:
           image-ref: 'docker.io/coredns/coredns:${{ matrix.versions }}'
           severity: 'CRITICAL,HIGH'