Replace asyncio.iscoroutinefunction with inspect

Starting in Python 3.14, use of `asyncio.iscoroutinefunction` emits a
deprecation warning (c.f. python/cpython#122858). The recommendation is
to use inspect.iscoroutinefunction instead.

Author: birdcar

tests/conftest.py

@@ -13,9 +13,10 @@
 from unittest.mock import AsyncMock, MagicMock
 import urllib.parse
 
+import inspect
+
 import httpx
 import pytest
-import asyncio
 from functools import wraps
 
 from tests.utils.client_configuration import ClientConfiguration
@@ -345,6 +346,6 @@ def sync_wrapper(*args, **kwargs):
             return func(*args, **kwargs)
 
     # Return appropriate wrapper based on whether the function is async or not
-    if asyncio.iscoroutinefunction(func):
+    if inspect.iscoroutinefunction(func):
         return async_wrapper
     return sync_wrapper