[FIX] server: close psql connections on shutdown

Stopping a threaded odoo server would spam the postgresql logs with
multiple:

<...> LOG:  could not receive data from client: Connection reset by peer

Let's avoid being rude and not hang up on postgresql connections
unexpectedly.

closes odoo/odoo#89955

X-original-commit: d0da17b167edee82381b6add573742e1cf663a9c
Signed-off-by: Raphael Collet <rco@odoo.com>

odoo/service/server.py

@@ -539,6 +539,8 @@ class ThreadedServer(CommonServer):
                     thread.join(0.05)
                     time.sleep(0.05)
 
+        odoo.sql_db.close_all()
+
         _logger.debug('--')
         logging.shutdown()