Bump aquasecurity/trivy-action from 0.24.0 to 0.28.0 (#428)

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](aquasecurity/trivy-action@6e7b7d1...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/ansible-aws-image-build.yml

@@ -83,7 +83,7 @@ jobs:
           docker load --input /tmp/ansible-aws-image.tar
 
       - name: Trivy scan
-        uses: aquasecurity/trivy-action@6e7b7d1fd3e4fef0c5fa8cce1229c54b2c9bd0d8
+        uses: aquasecurity/trivy-action@915b19bbe73b92a6cf82a1bc12b087c9a19a5fe2
         with:
           format: 'sarif'
           severity: 'CRITICAL,HIGH'