chore: bump aquasecurity/trivy-action from 0.19.0 to 0.21.0 (#6819)

Bumps [aquasecurity/trivy-action](https://github.com/aquasecurity/trivy-action) from 0.19.0 to 0.21.0.
- [Release notes](https://github.com/aquasecurity/trivy-action/releases)
- [Commits](https://github.com/aquasecurity/trivy-action/compare/d710430a6722f083d3b36b8339ff66b32f22ee55...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>