build(deps): bump docker/setup-buildx-action from 1.6.0 to 1.7.0

Bumps [docker/setup-buildx-action](https://github.com/docker/setup-buildx-action) from 1.6.0 to 1.7.0.
- [Release notes](https://github.com/docker/setup-buildx-action/releases)
- [Commits](docker/setup-buildx-action@v1.6.0...v1.7.0)

---
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/build_main.yml

@@ -143,7 +143,7 @@ jobs:
         echo ::set-output name=created::$(date -u +'%Y-%m-%dT%H:%M:%SZ')
 
     - name: Set up Docker Buildx
-      uses: docker/setup-buildx-action@v1.6.0
+      uses: docker/setup-buildx-action@v1.7.0
 
     - name: Login to GitHub Container Registry
       uses: docker/login-action@v1.14.1