fix logging tests

tests/logging_callback_tests/conftest.py

@@ -10,6 +10,16 @@ sys.path.insert(
     0, os.path.abspath("../..")
 )  # Adds the parent directory to the system path
 import litellm
+import asyncio
+
+@pytest.fixture(scope="session")
+def event_loop():
+    try:
+        loop = asyncio.get_running_loop()
+    except RuntimeError:
+        loop = asyncio.new_event_loop()
+    yield loop
+    loop.close()
 
 
 @pytest.fixture(scope="function", autouse=True)