🐛 Make user role doctest deterministic

The way the docstring is currently set up, it will randomly delete either "Test role" or "New Role". I assumed the list of roles was the same order everytime, when it fact it's random. This ensures that it's "new role" that acutally gets deleted

redcap/methods/user_roles.py

@@ -47,15 +47,15 @@ def export_user_roles(
 
         Examples:
             >>> proj.export_user_roles()
-            [{'unique_role_name': ..., 'role_label': 'New Role', 'design': '0', 'user_rights': '0',
+            [{'unique_role_name': ..., 'role_label': 'Test role', 'design': '0', 'user_rights': '0',
             'data_access_groups': '0', 'reports': '0', 'stats_and_charts': '0',
             'manage_survey_participants': '0', 'calendar': '0', 'data_import_tool': '0',
             'data_comparison_tool': '0', 'logging': '0', 'file_repository': '0',
             'data_quality_create': '0', 'data_quality_execute': '0', 'api_export': '0',
             'api_import': '0', 'mobile_app': '0', 'mobile_app_download_data': '0',
             'record_create': '0', 'record_rename': '0', 'record_delete': '0',
             'lock_records_customization': '0', 'lock_records': '0', ...,
-            'forms': {'form_1': 0}, 'forms_export': {'form_1': 0}}]
+            'forms': {'form_1': 2}, 'forms_export': {'form_1': 0}}]
         """
         payload = self._initialize_payload(content="userRole", format_type=format_type)
         return_type = self._lookup_return_type(format_type, request_type="export")
@@ -162,9 +162,12 @@ def delete_user_roles(
             1
 
             We don't know what the 'unique_role_name' is for the newly created role,
-            so we have to find that out. Since it's the last role created, it should
-            be the last one in the export result
-            >>> new_role_id = proj.export_user_roles()[-1]["unique_role_name"]
+            so we have to look it up by 'role_label'
+            >>> roles = proj.export_user_roles()
+            >>> new_role_id = [
+            ...     role for role in roles
+            ...     if role["role_label"] == "New Role"
+            ... ][0]["unique_role_name"]
 
             Delete the role
             >>> proj.delete_user_roles([new_role_id])