Merge pull request #5802 from learningequality/dependabot/github_actions/docker/setup-buildx-action-4

chore(deps): bump docker/setup-buildx-action from 3 to 4

Author: rtibbles

.github/workflows/containerbuild.yml

@@ -38,7 +38,7 @@ jobs:
       uses: docker/setup-qemu-action@v3
 
     - name: Set up Docker Buildx
-      uses: docker/setup-buildx-action@v3
+      uses: docker/setup-buildx-action@v4
 
     - name: Log in to Docker Hub
       if: github.event_name != 'pull_request'
@@ -94,7 +94,7 @@ jobs:
       uses: docker/setup-qemu-action@v3
 
     - name: Set up Docker Buildx
-      uses: docker/setup-buildx-action@v3
+      uses: docker/setup-buildx-action@v4
 
     - name: Build Docker image
       uses: docker/build-push-action@v7