typing: disable processing of mercurial/upgrade_utils/actions.py

There was a recent regression in pytype that causes processing to stall and
consume memory, and it doesn't sound like it will be fixed any time soon.

Differential Revision: https://phab.mercurial-scm.org/D10273

mercurial/upgrade_utils/actions.py

@@ -5,6 +5,9 @@
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
+# See https://github.com/google/pytype/issues/860
+# pytype: skip-file
+
 from __future__ import absolute_import
 
 from ..i18n import _