fix(tests): avoid asyncio DeprecationWarning in event loop fixture on 3.12+

tests/conftest.py

@@ -483,15 +483,26 @@ def _ensure_current_event_loop(request):
     A number of gateway tests still use asyncio.get_event_loop().run_until_complete(...).
     Ensure they always have a usable loop without interfering with pytest-asyncio's
     own loop management for @pytest.mark.asyncio tests.
+
+    On Python 3.12+, ``asyncio.get_event_loop_policy().get_event_loop()`` with no
+    *running* loop emits DeprecationWarning; skip that path and install a fresh
+    loop via ``new_event_loop()`` instead.
     """
     if request.node.get_closest_marker("asyncio") is not None:
         yield
         return
 
+    loop = None
     try:
-        loop = asyncio.get_event_loop_policy().get_event_loop()
+        loop = asyncio.get_running_loop()
     except RuntimeError:
-        loop = None
+        pass
+
+    if loop is None and sys.version_info < (3, 12):
+        try:
+            loop = asyncio.get_event_loop_policy().get_event_loop()
+        except RuntimeError:
+            loop = None
 
     created = loop is None or loop.is_closed()
     if created: