[13.0][FIX] server_environment: Change import for Serialized field

server_environment/models/server_env_mixin.py

@@ -8,6 +8,8 @@ from lxml import etree
 
 from odoo import api, fields, models
 
+from odoo.addons.base_sparse_field.models.fields import Serialized
+
 from ..server_env import serv_config
 
 _logger = logging.getLogger(__name__)
@@ -100,7 +102,7 @@ class ServerEnvMixin(models.AbstractModel):
     _name = "server.env.mixin"
     _description = "Mixin to add server environment in existing models"
 
-    server_env_defaults = fields.Serialized()
+    server_env_defaults = Serialized()
 
     _server_env_getter_mapping = {
         "integer": "getint",