CI: Fix warning from SSL transport (again) (#41279)

Author: Dr-Irv

pandas/_testing/_warnings.py

@@ -143,7 +143,7 @@ def _assert_caught_no_extra_warnings(
     for actual_warning in caught_warnings:
         if _is_unexpected_warning(actual_warning, expected_warning):
             unclosed = "unclosed transport <asyncio.sslproto._SSLProtocolTransport"
-            if isinstance(actual_warning, ResourceWarning) and unclosed in str(
+            if actual_warning.category == ResourceWarning and unclosed in str(
                 actual_warning.message
             ):
                 # FIXME: kludge because pytest.filterwarnings does not