Fix deprecated hook_field_widget_form_alter() and hook_field_widget_WIDGET_TYPE_form_alter()

PR ready for review: https://github.com/goalgorilla/open_social/pull/3529

zanvidmar → credited Bia_inacio → .

zanvidmar → credited nkoporec → .

Fix available from 12.0.x and above.

Automatically closed - issue fixed for 2 weeks with no activity.