cli: fix asyncio runner bug for 3.10 (#860)

.github/workflows/_integration_test.yml

@@ -12,6 +12,7 @@ jobs:
     strategy:
       matrix:
         python-version:
+          - "3.10"
           - "3.11"
     name: "CLI integration test"
     defaults:

libs/cli/langgraph_cli/exec.py

@@ -22,7 +22,7 @@ def Runner():
                 pass
 
             def run(self, coro):
-                asyncio.run(coro)
+                return asyncio.run(coro)
 
         yield _Runner()