Merge pull request #353 from chaspy/renovate/docker-setup-buildx-acti…

…on-2.x

Update docker/setup-buildx-action action to v2

.github/workflows/docker.yml

@@ -33,7 +33,7 @@ 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
+        uses: docker/setup-buildx-action@v2
       - 
         name: Login to DockerHub
         uses: docker/login-action@v2