build(deps): bump aquasecurity/trivy-action from 0.27.0 to 0.28.0 (op…

…en-policy-agent#7123)

Bumps [aquasecurity/trivy-action](https://github.com/aquasecurity/trivy-action) from 0.27.0 to 0.28.0.
- [Release notes](https://github.com/aquasecurity/trivy-action/releases)
- [Commits](aquasecurity/trivy-action@5681af8...915b19b)

---
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/nightly.yaml

@@ -113,7 +113,7 @@ jobs:
       # Equivalent to:
       # $ trivy image openpolicyagent/opa:edge-static
       - name: Run Trivy scan on image
-        uses: aquasecurity/trivy-action@5681af892cd0f4997658e2bacc62bd0a894cf564 # 0.27.0
+        uses: aquasecurity/trivy-action@915b19bbe73b92a6cf82a1bc12b087c9a19a5fe2 # 0.28.0
         with:
           image-ref: 'openpolicyagent/opa:edge-static'
           format: table
@@ -143,7 +143,7 @@ jobs:
       # Equivalent to:
       # $ trivy fs .
       - name: Run Trivy scan on repo
-        uses: aquasecurity/trivy-action@5681af892cd0f4997658e2bacc62bd0a894cf564 # 0.27.0
+        uses: aquasecurity/trivy-action@915b19bbe73b92a6cf82a1bc12b087c9a19a5fe2 # 0.28.0
         with:
           scan-type: fs
           format: table