Make signal receiver for post_revision_commit non-weak

aleksis/apps/chronos/apps.py

@@ -32,4 +32,4 @@ class ChronosConfig(AppConfig):
             """Handle a new post revision commit signal in background."""
             transaction.on_commit(lambda: handle_new_revision.delay(revision.pk))
 
-        post_revision_commit.connect(_handle_post_revision_commit)
+        post_revision_commit.connect(_handle_post_revision_commit, weak=False)