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

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@0.24.0...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/call-trivy.yaml

@@ -44,19 +44,19 @@ jobs:
       # merge to one step
       # https://github.com/aquasecurity/trivy-action/issues/313
       - name: Scan agent
-        uses: aquasecurity/trivy-action@0.24.0
+        uses: aquasecurity/trivy-action@0.28.0
         with:
           input: output/image/egressgateway-agent.tar
           severity: 'CRITICAL,HIGH'
 
       - name: Scan controller
-        uses: aquasecurity/trivy-action@0.24.0
+        uses: aquasecurity/trivy-action@0.28.0
         with:
           input: output/image/egressgateway-controller.tar
           severity: 'CRITICAL,HIGH'
 
       - name: Scan nettools
-        uses: aquasecurity/trivy-action@0.24.0
+        uses: aquasecurity/trivy-action@0.28.0
         with:
           input: output/image/egressgateway-nettools.tar
           severity: 'CRITICAL,HIGH'