devel: officially deprecate dirstate.write without transaction argument

When we introduce the develwarning, we did not had an official deprecation API
and infrastructure. We can now officially deprecate the old way with a version
deadline.

mercurial/dirstate.py

@@ -694,9 +694,9 b' class dirstate(object):'
 
         filename = self._filename
         if tr is False: # not explicitly specified
-            self._ui.develwarn('use dirstate.write with '
+            self._ui.deprecwarn('use dirstate.write with '
                                'repo.currenttransaction()',
-                               config='check-dirstate-write')
+                               '3.9')
 
             if self._opener.lexists(self._pendingfilename):
                 # if pending file already exists, in-memory changes