Merge pull request #1241 from jupyterhub/dependabot/github_actions/docker/build-push-action-4

build(deps): bump docker/build-push-action from 3 to 4

.github/workflows/docker.yml

@@ -38,7 +38,7 @@ jobs:
 
       # https://github.com/docker/build-push-action
       - name: Build Docker image
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v4
         with:
           context: .
           tags: jupyter/repo2docker:pr

.github/workflows/release.yml

@@ -124,7 +124,7 @@ jobs:
           echo "TAGS=$TAGS" >> $GITHUB_ENV
 
       - name: Build and push repo2docker
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v4
         with:
           context: .
           platforms: linux/amd64,linux/arm64