Remove downstream_check (ipython#1318)

Author: Carreau

.github/workflows/downstream.yml

@@ -147,20 +147,3 @@ jobs:
         run: |
           cd ${GITHUB_WORKSPACE}/../spyder-kernels
           xvfb-run --auto-servernum ${pythonLocation}/bin/python -m pytest -x -vv -s --full-trace --color=yes spyder_kernels
-
-  downstream_check: # This job does nothing and is only used for the branch protection
-    if: always()
-    needs:
-      - nbclient
-      - ipywidgets
-      - jupyter_client
-      - ipyparallel
-      - jupyter_kernel_test
-      - spyder_kernels
-      - qtconsole
-    runs-on: ubuntu-latest
-    steps:
-      - name: Decide whether the needed jobs succeeded or failed
-        uses: re-actors/alls-green@release/v1
-        with:
-          jobs: ${{ toJSON(needs) }}