[FIX] stock_*: use sudo log activity

Problem:
In some places I think it is necessary to use sudo to avoid permission
errors when creating actions or something else from a other model.

For example, I have a picking created from PO attached to MO. When
receiving inventory in a smaller quantity than actual quantity, will
create activity schedule on MO. But if you don't have the rights, you
will get an error

closes odoo/odoo#150697

X-original-commit: ac1862ddc2dec0269a156d5470b940a7d85cc078
Signed-off-by: William Henrotin (whe) <whe@odoo.com>

addons/stock/models/stock_picking.py

@@ -1365,7 +1365,7 @@ class Picking(models.Model):
         """
         for (parent, responsible), rendering_context in documents.items():
             note = render_method(rendering_context)
-            parent.activity_schedule(
+            parent.sudo().activity_schedule(
                 'mail.mail_activity_data_warning',
                 date.today(),
                 note=note,