tests: Ignore test_restart hang on Windows

tests/end2end/test_invocations.py

@@ -1039,6 +1039,8 @@ def test_restart(request, quteproc_new):
     pid = int(line.message.removeprefix(prefix))
     os.kill(pid, signal.SIGTERM)
 
+    # This often hangs on Windows for unknown reasons
+    if not utils.is_windows:
         try:
             # If the new process hangs, this will hang too.
             # Still better than just ignoring it, so we can fix it if something is broken.