FormElement is deprecated in Drupal 10.3

Problem/Motivation

phpstan reports,

Class Drupal\address\Element\Address extends deprecated class Drupal\Core\Render\Element\FormElement:
in drupal:10.3.0 and is removed from drupal:12.0.0. use
\Drupal\Core\Render\Element\FormElementBase instead

and the same for Country, Zone, and ZoneTerritory.

Steps to reproduce

`phpstan analyse address`

Proposed resolution

use FormElementBase instead.

Remaining tasks

make an MR