fixed workflow

Author: tsmbland

.github/workflows/binder.yaml

@@ -11,9 +11,9 @@ jobs:
         ref: ${{ github.event.pull_request.head.sha }}
 
     - name: update jupyter dependencies with repo2docker
-      uses: jupyterhub/repo2docker-action@master
+      uses: tsmbland/repo2docker-action@master
       with:
         DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
         DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
         BINDER_CACHE: true
-        PUBLIC_REGISTRY_CHECK: true
+        PUBLIC_REGISTRY_CHECK: true