test(langgraph): skip the invalid-resume sibling test before Python 3.11

Async nodes can't call interrupt() on Python 3.10, which doesn't carry the run config into async tasks. Skip it there like the other async interrupt tests.

libs/langgraph/tests/test_interruption.py

@@ -1,5 +1,6 @@
 import asyncio
 import operator
+import sys
 from dataclasses import dataclass
 from typing import Annotated, Any
 
@@ -255,6 +256,10 @@ def test_interrupt_response_schema_invalid_resume_after_earlier_interrupt(
     }
 
 
+@pytest.mark.skipif(
+    sys.version_info < (3, 11),
+    reason="Python 3.11+ is required for async contextvars support",
+)
 async def test_invalid_resume_lets_other_answered_tasks_finish(
     async_checkpointer: BaseCheckpointSaver,
 ) -> None: