[FIX] base: use time zone aware display field for currency rates

Steps to reproduce:

1. change system and admin's time zone to one with a different
date than UTC
2. enable multi-currency in the accounting module
3. add rates for the current date in local time zone and UTC
4. go to settings > currencies
5. the rate for the UTC date is displayed

To fix this, we should use a time zone aware field in `res_currency`.

opw-2945108

closes odoo/odoo#100123

Signed-off-by: William André (wan) <wan@odoo.com>

odoo/addons/base/models/res_currency.py

@@ -62,7 +62,7 @@ class Currency(models.Model):
 
     @api.depends('rate_ids.rate')
     def _compute_current_rate(self):
-        date = self._context.get('date') or fields.Date.today()
+        date = self._context.get('date') or fields.Date.context_today(self)
         company = self.env['res.company'].browse(self._context.get('company_id')) or self.env.company
         # the subquery selects the last rate before 'date' for the given currency/company
         currency_rates = self._get_rates(company, date)