pythongh-128694: Fix (env changed) error in test_inspect (python#128702)

Author: sobolevn

Lib/test/test_inspect/test_inspect.py

@@ -1,4 +1,5 @@
 from annotationlib import Format, ForwardRef
+import asyncio
 import builtins
 import collections
 import copy
@@ -2791,6 +2792,10 @@ async def number_asyncgen():
     async def asyncTearDown(self):
         await self.asyncgen.aclose()
 
+    @classmethod
+    def tearDownClass(cls):
+        asyncio._set_event_loop_policy(None)
+
     def _asyncgenstate(self):
         return inspect.getasyncgenstate(self.asyncgen)