Ignore warnings so people can run tests on python 3.12 (#15663)

Author: AlanCoding

pytest.ini

@@ -15,6 +15,17 @@ markers =
 filterwarnings =
   error
 
+  # NOTE: The following are introduced upgrading python 3.11 to python 3.12
+  # FIXME: Upgrade django-polymorphic https://github.com/jazzband/django-polymorphic/pull/541
+  once:Deprecated call to `pkg_resources.declare_namespace\('sphinxcontrib'\)`.\nImplementing implicit namespace packages \(as specified in PEP 420\) is preferred to `pkg_resources.declare_namespace`.:DeprecationWarning
+
+  # FIXME: Upgrade protobuf https://github.com/protocolbuffers/protobuf/issues/15077
+  once:Type google._upb._message.* uses PyType_Spec with a metaclass that has custom tp_new:DeprecationWarning
+
+  # FIXME: Upgrade python-dateutil https://github.com/dateutil/dateutil/issues/1340
+  once:datetime.datetime.utcfromtimestamp\(\) is deprecated and scheduled for removal in a future version. Use timezone-aware objects to represent datetimes in UTC:DeprecationWarning
+
+  # NOTE: the following are present using python 3.11
   # FIXME: Set `USE_TZ` to `True`.
   once:The default value of USE_TZ will change from False to True in Django 5.0. Set USE_TZ to False in your project settings if you want to keep the current default behavior.:django.utils.deprecation.RemovedInDjango50Warning:django.conf