Merge pull request #5800 from learningequality/dependabot/github_actions/docker/login-action-4

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

Author: rtibbles

.github/workflows/containerbuild.yml

@@ -42,7 +42,7 @@ jobs:
 
     - name: Log in to Docker Hub
       if: github.event_name != 'pull_request'
-      uses: docker/login-action@v3
+      uses: docker/login-action@v4
       with:
         registry: ghcr.io
         username: ${{ github.actor }}