tests: filter warnings related to EOL Python

Author: parthea

packages/google-cloud-documentai-toolbox/pytest.ini

@@ -17,3 +17,4 @@ filterwarnings =
     ignore:The python-bigquery library will stop supporting Python 3.7 and Python 3.8:PendingDeprecationWarning
     # This error is expected for python versions that approach EOL
     ignore:.*Please upgrade to the latest Python version.*:FutureWarning
+    ignore:(?s).*using a Python version.*past its end of life.*:FutureWarning