Stop sub-classing object (#8249)

synapse/federation/sender/__init__.py

@@ -56,7 +56,7 @@ sent_pdus_destination_dist_total = Counter(
 )
 
 
-class FederationSender(object):
+class FederationSender:
     def __init__(self, hs: "synapse.server.HomeServer"):
         self.hs = hs
         self.server_name = hs.hostname

synapse/federation/sender/per_destination_queue.py

@@ -53,7 +53,7 @@ sent_edus_by_type = Counter(
 )
 
 
-class PerDestinationQueue(object):
+class PerDestinationQueue:
     """
     Manages the per-destination transmission queues.
 

synapse/federation/sender/transaction_manager.py

@@ -35,7 +35,7 @@ if TYPE_CHECKING:
 logger = logging.getLogger(__name__)
 
 
-class TransactionManager(object):
+class TransactionManager:
     """Helper class which handles building and sending transactions
 
     shared between PerDestinationQueue objects