Prevent PRs on this repo

Author: zooba

.github/workflows/autoclose.yaml

@@ -0,0 +1,17 @@
+name: Close Pull Requests
+
+on:
+  pull_request_target:
+    types: [opened]
+
+jobs:
+  run:
+    runs-on: ubuntu-latest
+    steps:
+    # Pin to commit hash to avoid surprises via the action
+    - uses: superbrothers/close-pull-request@9c18513d320d7b2c7185fb93396d0c664d5d8448
+      with:
+        comment: |
+            We do not accept PRs on this repository. Please file an issue at
+            https://github.com/python/cpython requesting an update to the
+            source packages in this repository.