Whoops

.github/workflows/main_matrix.yml

@@ -112,7 +112,7 @@ jobs:
           repository: ${{github.event.pull_request.head.repo.full_name}}
 
       - name: Setup Python
-        uses: actions/setup-python
+        uses: actions/setup-python@v4
         with:
           python-version: 3.x