[3.11] gh-109538: Catch closed loop runtime error and issue warning (GH-111983) (#112141)

Issue a ResourceWarning instead.

Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>
(cherry picked from commit e0f5127975)

Lib/asyncio/streams.py

@@ -404,8 +404,11 @@ class StreamWriter:
 
     def __del__(self):
         if not self._transport.is_closing():
-            self.close()
-
+            if self._loop.is_closed():
+                warnings.warn("loop is closed", ResourceWarning)
+            else:
+                self.close()
+                warnings.warn(f"unclosed {self!r}", ResourceWarning)
 
 class StreamReader: