[ci skip]: Bump docker/setup-buildx-action from 1.5.1 to 1.6.0

Bumps [docker/setup-buildx-action](https://github.com/docker/setup-buildx-action) from 1.5.1 to 1.6.0.
- [Release notes](https://github.com/docker/setup-buildx-action/releases)
- [Commits](https://github.com/docker/setup-buildx-action/compare/v1.5.1...v1.6.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/publish.yml

@@ -30,7 +30,7 @@ jobs:
               with:
                   platforms: linux/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64/v8,linux/ppc64le,linux/s390x
             - name: Set up Docker Buildx
-              uses: docker/setup-buildx-action@v1.5.1
+              uses: docker/setup-buildx-action@v1.6.0
             - name: Login to DockerHub
               uses: docker/login-action@v1.10.0
               with: