[FIX] base_geolocalize: update log when request to openstreetmap fails

When the user will not get an HTTP response as 200 while retrieving the location
using OpenStreetMap Nominatim service, the logger error will occur.

The logger is updated to use the 'warning' level instead of the 'error' level.
This change reflects a less severe logging level for cases where a request to
OpenStreetMap fails.

sentry-4151622143

closes odoo/odoo#125785

X-original-commit: a73a65ef
Signed-off-by: Julien Castiaux (juc) <juc@odoo.com>