dsession,workermanage: drop handling of pytest_captured_warning

Since d153e0a4c4 the remote doesn't send
events for this hook at all (I think perhaps wrongly, but it's history
by now), so no point in handling it in the coordinator side.

src/xdist/dsession.py

@@ -317,13 +317,6 @@ class DSession:
         assert not rep.passed
         self._failed_worker_collectreport(node, rep)
 
-    def worker_warning_captured(self, warning_message, when, item):
-        """Emitted when a node calls the pytest_warning_captured hook (deprecated in 6.0)."""
-        # This hook as been removed in pytest 7.1, and we can remove support once we only
-        # support pytest >=7.1.
-        kwargs = dict(warning_message=warning_message, when=when, item=item)
-        self.config.hook.pytest_warning_captured.call_historic(kwargs=kwargs)
-
     def worker_warning_recorded(self, warning_message, when, nodeid, location):
         """Emitted when a node calls the pytest_warning_recorded hook."""
         kwargs = dict(

src/xdist/workermanage.py

@@ -374,16 +374,6 @@ class WorkerController:
                     nodeid=kwargs["nodeid"],
                     fslocation=kwargs["nodeid"],
                 )
-            elif eventname == "warning_captured":
-                warning_message = unserialize_warning_message(
-                    kwargs["warning_message_data"]
-                )
-                self.notify_inproc(
-                    eventname,
-                    warning_message=warning_message,
-                    when=kwargs["when"],
-                    item=kwargs["item"],
-                )
             elif eventname == "warning_recorded":
                 warning_message = unserialize_warning_message(
                     kwargs["warning_message_data"]