Switch from asyncio.iscoroutinefunction to inspect for Py 3.14+.

The former causes: DeprecationWarning:
'asyncio.iscoroutinefunction' is deprecated and slated for removal
in Python 3.16; use inspect.iscoroutinefunction() instead.

Fixes: #635

async_lru/__init__.py

@@ -27,6 +27,12 @@
 else:
     from typing_extensions import Self
 
+if sys.version_info >= (3, 14):
+    import inspect
+    iscoroutinefunction = inspect.iscoroutinefunction
+else:
+    iscoroutinefunction = asyncio.iscoroutinefunction
+
 
 __version__ = "2.0.4"
 
@@ -299,7 +305,7 @@ def wrapper(fn: _CBP[_R]) -> _LRUCacheWrapper[_R]:
         while isinstance(origin, (partial, partialmethod)):
             origin = origin.func
 
-        if not asyncio.iscoroutinefunction(origin):
+        if not iscoroutinefunction(origin):
             raise RuntimeError(f"Coroutine function is required, got {fn!r}")
 
         # functools.partialmethod support

tests/test_basic.py

@@ -1,12 +1,13 @@
 import asyncio
+import inspect
 import platform
 import sys
 from functools import _CacheInfo, partial
 from typing import Callable
 
 import pytest
 
-from async_lru import _CacheParameters, alru_cache
+from async_lru import _CacheParameters, alru_cache, iscoroutinefunction
 
 
 def test_alru_cache_not_callable() -> None:
@@ -27,7 +28,7 @@ async def test_alru_cache_deco(check_lru: Callable[..., None]) -> None:
     async def coro() -> None:
         pass
 
-    assert asyncio.iscoroutinefunction(coro)
+    assert iscoroutinefunction(coro)
 
     check_lru(coro, hits=0, misses=0, cache=0, tasks=0)
 
@@ -41,7 +42,7 @@ async def test_alru_cache_deco_called(check_lru: Callable[..., None]) -> None:
     async def coro() -> None:
         pass
 
-    assert asyncio.iscoroutinefunction(coro)
+    assert iscoroutinefunction(coro)
 
     check_lru(coro, hits=0, misses=0, cache=0, tasks=0)
 
@@ -56,7 +57,7 @@ async def coro() -> None:
 
     coro_wrapped = alru_cache(coro)
 
-    assert asyncio.iscoroutinefunction(coro_wrapped)
+    assert iscoroutinefunction(coro_wrapped)
 
     check_lru(coro_wrapped, hits=0, misses=0, cache=0, tasks=0)