[FIX] planning: fix sorting of records in Gantt view

Steps to reproduce:
Open the gantt view and add a few shifts for different resources

Observed behavior:
https://nimb.ws/1t38Jl resources are not sorted by alphabetical order

Expected behavior:
https://nimb.ws/NqIAG3 resources should be sorted by alphabetical order

task-2633936

closes odoo/odoo#76621

X-original-commit: 9c4ed2bcadc417a2927877902c4c275e5d9d16d5
Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>
Signed-off-by: LTU-Odoo <IT-Ideas@users.noreply.github.com>

addons/resource/models/resource.py

@@ -862,6 +862,7 @@ class ResourceCalendarAttendance(models.Model):
 class ResourceResource(models.Model):
     _name = "resource.resource"
     _description = "Resources"
+    _order = "name"
 
     @api.model
     def default_get(self, fields):