Use ruff instead of black, flake8, autoflake, pyupgrade

Config adapted from pytest.

src/xdist/scheduler/load.py

@@ -243,7 +243,7 @@ class LoadScheduling:
             return
 
         # Collections are identical, create the index of pending items.
-        self.collection = list(self.node2collection.values())[0]
+        self.collection = next(iter(self.node2collection.values()))
         self.pending[:] = range(len(self.collection))
         if not self.collection:
             return
@@ -260,7 +260,7 @@ class LoadScheduling:
             # to each node - which is suboptimal when you have less than
             # 2 * len(nodes) tests.
             nodes = cycle(self.nodes)
-            for i in range(len(self.pending)):
+            for _ in range(len(self.pending)):
                 self._send_tests(next(nodes), 1)
         else:
             # Send batches of consecutive tests. By default, pytest sorts tests

src/xdist/scheduler/loadscope.py

@@ -208,7 +208,6 @@ class LoadScopeScheduling:
 
         - ``DSession.worker_collectionfinish``.
         """
-
         # Check that add_node() was called on the node before
         assert node in self.assigned_work
 
@@ -301,7 +300,6 @@ class LoadScopeScheduling:
         If there are any globally pending work units left then this will check
         if the given node should be given any more tests.
         """
-
         # Do not add more work to a node shutting down
         if node.shutting_down:
             return

src/xdist/scheduler/worksteal.py

@@ -1,4 +1,7 @@
-from collections import namedtuple
+from __future__ import annotations
+
+from typing import Any
+from typing import NamedTuple
 
 from _pytest.runner import CollectReport
 
@@ -7,7 +10,10 @@ from xdist.report import report_collection_diff
 from xdist.workermanage import parse_spec_config
 
 
-NodePending = namedtuple("NodePending", ["node", "pending"])
+class NodePending(NamedTuple):
+    node: Any
+    pending: list[int]
+
 
 # Every worker needs at least 2 tests in queue - the current and the next one.
 MIN_PENDING = 2
@@ -285,7 +291,7 @@ class WorkStealingScheduling:
             return
 
         # Collections are identical, create the index of pending items.
-        self.collection = list(self.node2collection.values())[0]
+        self.collection = next(iter(self.node2collection.values()))
         self.pending[:] = range(len(self.collection))
         if not self.collection:
             return