[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

src/xdist/workermanage.py

@@ -96,7 +96,9 @@ def setup_nodes(
         self.config.hook.pytest_xdist_setupnodes(config=self.config, specs=self.specs)
         self.trace("setting up nodes")
         with ThreadPoolExecutor(max_workers=len(self.specs)) as executor:
-            futs = [executor.submit(self.setup_node, spec, putevent) for spec in self.specs]
+            futs = [
+                executor.submit(self.setup_node, spec, putevent) for spec in self.specs
+            ]
             return [f.result() for f in futs]
 
     def setup_node(