Docs builds failing

The docs are failing with this warning:

WARNING: error while formatting arguments for irc.client.PrioritizedHandler: Handler <function update_defvalue at 0x105389a80> for event 'autodoc-before-process-signature' threw an exception (exception: )

There's nothing particularly special about that class:

irc/irc/client.py

Lines 682 to 685 in 6a3c948

    
           class PrioritizedHandler(collections.namedtuple('Base', ('priority', 'callback'))): 
        
               def __lt__(self, other): 
        
                   "when sorting prioritized handlers, only use the priority" 
        
                   return self.priority < other.priority

Upstream issue is sphinx-doc/sphinx#11543.

	class PrioritizedHandler(collections.namedtuple('Base', ('priority', 'callback'))):
	def __lt__(self, other):
	"when sorting prioritized handlers, only use the priority"
	return self.priority < other.priority