[FIX] hr_timesheet: fix date issue in activity report

Before this commit, the date taken into account to retrieve people
activities in the project update description was the UTC date. The
activities just recorded with the context_today date wasn't taken into
account.

Failing unit tests during nightly build (when date UTC < date GMT+2):
- `TestProjectUpdateHrTimesheet.test_project_update_description_people`
"AssertionError: 0 != 1 : The number of recorded timesheet activities
is 1"
- `TestProjectUpdateHrTimesheet.test_project_update_form_people`
"AssertionError: False is not true : The description should contain
'People'"

This commit fixes the issue using the context_today(self) date as a
reference.

Fixes PR : #68899
task-2393768

closes odoo/odoo#71585

Signed-off-by: LTU-Odoo <IT-Ideas@users.noreply.github.com>

addons/hr_timesheet/models/project_update.py

@@ -28,10 +28,10 @@ class ProjectUpdate(models.Model):
     def _get_activities(self, project):
         if not self.user_has_groups('hr_timesheet.group_hr_timesheet_user'):
             return []
-        today = fields.Datetime.today()
+        today = fields.Date.context_today(self)
         query = """
                 SELECT timesheet.employee_id as employee_id,
-                       gs as period,
+                       gs::date as period,
                        sum(timesheet.unit_amount) as unit_amount,
                        employee.name as name
                   FROM project_project p
@@ -40,8 +40,8 @@ class ProjectUpdate(models.Model):
             INNER JOIN hr_employee employee
                     ON timesheet.employee_id = employee.id
             CROSS JOIN generate_series(
-                        %(today)s::date - '180 days'::interval,
-                        %(today)s::date,
+                        %(today)s - '180 days'::interval,
+                        %(today)s,
                         '30 days'::interval
                        ) gs
                  WHERE p.id = %(project_id)s