title: Convert datetime without timezone to own timezone without taking into account daylight saving time
body: <p>I have the following dates that I want to convert to this time zone:</p>
  <pre><code>ticket_date:
  1. 2022-04-23 11:20:44
  2. 2022-02-23 11:20:44
  </code></pre>
  <pre><code>timezone = pytz.timezone('America/Mexico_City')
  picking.ticket_date = fields.Datetime.to_string(pytz.timezone(self.env.context['tz']).localize( fields.Datetime.from_string(ticket_date), is_dst=None).astimezone(timezone))
  
  </code></pre>
  <p>In the first case I get the correct time, but in the second case I get one hour less. How can I avoid this behavior? I need this because I am converting a batch of dates before daylight saving time.</p>