[upd] github-actions: Bump docker/scout-action from 1.18.2 to 1.20.2 (#5854)

Bumps [docker/scout-action](https://github.com/docker/scout-action) from 1.18.2 to 1.20.2.
- [Release notes](https://github.com/docker/scout-action/releases)
- [Commits](https://github.com/docker/scout-action/compare/f8c776824083494ab0d56b8105ba2ca85c86e4de...1128f02d1e60f339af7306e0e62b9fdc13d9fab9)

---
updated-dependencies:
- dependency-name: docker/scout-action
  dependency-version: 1.20.2
  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/security.yml

@@ -29,7 +29,7 @@ jobs:
           persist-credentials: "false"
 
       - name: Sync GHCS from Docker Scout
-        uses: docker/scout-action@f8c776824083494ab0d56b8105ba2ca85c86e4de  # v1.18.2
+        uses: docker/scout-action@1128f02d1e60f339af7306e0e62b9fdc13d9fab9  # v1.20.2
         with:
           organization: "searxng"
           dockerhub-user: "${{ secrets.DOCKER_USER }}"