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

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

testing/test_dsession.py

@@ -583,7 +583,7 @@ def test_first_node_failure(self, pytester: pytest.Pytester) -> None:
 
         # First node fails before collection
         sched.remove_node(node1)
-        
+
         # Now first_node should be reset after removal
         # Add a new node, it should become the collector
         node3 = MockNode()