[ci skip]: Bump docker/build-push-action from 2.5.0 to 2.6.1

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 2.5.0 to 2.6.1.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v2.5.0...v2.6.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/publish.yml

@@ -35,7 +35,7 @@ jobs:
  username: ${{ secrets.DOCKER_USERNAME }}
  password: ${{ secrets.DOCKER_PASSWORD }}
  - name: Build and push
- uses: docker/build-push-action@v2.5.0
+ uses: docker/build-push-action@v2.6.1
  with:
  context: .
  push: true