Update planning_slot.py

m22_planning/models/planning_slot.py

@@ -9,8 +9,7 @@ from math import modf
 from random import randint
 
 from odoo import api, fields, models, _
-from odoo.addons.resource.models.resource import Intervals, sum_intervals, string_to_datetime
-from odoo.addons.resource.models.resource_mixin import timezone_datetime
+from odoo.addons.resource.models.utils import Intervals, sum_intervals, string_to_datetime, timezone_datetime
 from odoo.exceptions import UserError, AccessError
 from odoo.osv import expression
 from odoo.tools import DEFAULT_SERVER_DATETIME_FORMAT, float_utils, format_datetime