Bump docker/setup-buildx-action from 1 to 2 (#100)

Bumps [docker/setup-buildx-action](https://github.com/docker/setup-buildx-action) from 1 to 2.
- [Release notes](https://github.com/docker/setup-buildx-action/releases)
- [Commits](docker/setup-buildx-action@v1...v2)

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

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

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -46,7 +46,7 @@ jobs:
           sed -i 's|nginx-plus-\${NGINX_PLUS_VERSION}|nginx-plus|g' docker/Dockerfile
           sed -i 's|\${NGINX_PLUS_VERSION^^}/||g' docker/Dockerfile
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v1
+        uses: docker/setup-buildx-action@v2
       - name: Build Plus Docker Image
         uses: docker/build-push-action@v2
         with: