Bump aquasecurity/trivy-action from 0.20.0 to 0.21.0 (#29831)

Bumps [aquasecurity/trivy-action](https://github.com/aquasecurity/trivy-action) from 0.20.0 to 0.21.0.
- [Release notes](https://github.com/aquasecurity/trivy-action/releases)
- [Commits](https://github.com/aquasecurity/trivy-action/compare/b2933f565dbc598b29947660e66259e3c7bc8561...fd25fed6972e341ff0007ddb61f77e88103953c2)

---
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-analysis.yml

@@ -19,7 +19,7 @@ jobs:
       fail-fast: false
     steps:
       - name: Run Trivy vulnerability scanner
-        uses: aquasecurity/trivy-action@b2933f565dbc598b29947660e66259e3c7bc8561
+        uses: aquasecurity/trivy-action@fd25fed6972e341ff0007ddb61f77e88103953c2
         with:
           image-ref: quay.io/keycloak/${{ matrix.container}}:nightly
           format: sarif