Merge PR #6872

This change updates the pytest configuration to defeat the
unintentional resource leaks caused by an incorrect method of
suppressing the `PytestUnraisableExceptionWarning`s.

Contributed by Thomas Grainger.

(cherry picked from commit 799dc87)

setup.cfg

@@ -137,8 +137,7 @@ filterwarnings =
     ignore:coroutine 'ClientSession._request' was never awaited:RuntimeWarning
     ignore:Unclosed client session <aiohttp.client.ClientSession object at 0x:ResourceWarning
     ignore:unclosed file <_io.FileIO.*:ResourceWarning
-    # Temporarily ignore warnings internal to Python 3.9.7, can be removed again in 3.9.8.
-    ignore:The loop argument is deprecated since Python 3.8, and scheduled for removal in Python 3.10.:DeprecationWarning:asyncio
+    ignore:The loop argument is deprecated:DeprecationWarning:asyncio
     ignore:Creating a LegacyVersion has been deprecated and will be removed in the next major release:DeprecationWarning::
     # The following deprecation warning is triggered by importing
     # `gunicorn.util`. Hopefully, it'll get fixed in the future. See