[upd] github-actions: Bump docker/scout-action from 1.20.3 to 1.20.4 (#5963)

Bumps [docker/scout-action](https://github.com/docker/scout-action) from 1.20.3 to 1.20.4.
- [Release notes](https://github.com/docker/scout-action/releases)
- [Commits](8910519cee...bacf462e8d)

---
updated-dependencies:
- dependency-name: docker/scout-action
  dependency-version: 1.20.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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@8910519cee8ac046f3ee99686b0dc6654d5ba1a7  # v1.20.3
+        uses: docker/scout-action@bacf462e8d090c09660de30a6ccc718035f961e3  # v1.20.4
         with:
           organization: "searxng"
           dockerhub-user: "${{ secrets.DOCKER_USER }}"