Fix asyncio.iscoroutinefunction DeprecationWarning in Python 3.14.0a1

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

Signed-off-by: Zac Medico <zmedico@gentoo.org>

lib/portage/process.py

@@ -23,6 +23,11 @@
 from functools import lru_cache, partial
 from typing import Any, Optional, Callable, Union
 
+try:
+    from inspect import iscoroutinefunction
+except ImportError:
+    iscoroutinefunction = _asyncio.iscoroutinefunction
+
 from portage import os
 from portage import _encodings
 from portage import _unicode_encode
@@ -203,7 +208,7 @@ def atexit_register(func, *args, **kargs):
     manually by calling the run_exitfuncs() function in this module."""
     # The internal asyncio wrapper module would trigger a circular import
     # if used here.
-    if _asyncio.iscoroutinefunction(func):
+    if iscoroutinefunction(func):
         # Add this coroutine function to the exit handlers for the loop
         # which is associated with the current thread.
         global_event_loop()._coroutine_exithandlers.append((func, args, kargs))

lib/portage/util/futures/_asyncio/__init__.py

@@ -38,13 +38,17 @@
     FIRST_EXCEPTION,
     Future,
     InvalidStateError,
-    iscoroutinefunction,
     Lock as _Lock,
     shield,
     TimeoutError,
     wait_for,
 )
 
+try:
+    from inspect import iscoroutinefunction
+except ImportError:
+    iscoroutinefunction = _asyncio.iscoroutinefunction
+
 import threading
 from typing import Optional