Bump docker/build-push-action from 6.8.0 to 6.9.0 (#78)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 6.8.0 to 6.9.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v6.8.0...v6.9.0)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/check_versions.yml

@@ -26,7 +26,7 @@ jobs:
       latestver: ${{ steps.latest-version.outputs.latestver }}
     steps:
       - name: Build image
-        uses: docker/build-push-action@v6.8.0
+        uses: docker/build-push-action@v6.9.0
         with:
           push: false
           load: true