statichttprepo: disable pushkey

mercurial/statichttprepo.py

@@ -129,6 +129,7 b' class statichttprepository(localrepo.loc'
         self._branchcachetip = None
         self.encodepats = None
         self.decodepats = None
+        self.capabilities.remove("pushkey")
 
     def url(self):
         return self._url