Wrong value for 'render element' in hook_theme()

Problem/Motivation

The value for render element in form_options_attributes_theme is wrong and leads to errors during processing in specific conditions. Instead of 'elements' it should use the singular version 'element' just like the base theme, see select in https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Theme%21T...

'select' => [
  'render element' => 'element',
  'initial preprocess' => FormPreprocess::class . ':preprocessSelect',
],

Steps to reproduce

Not sure for the steps, as my setup is very custom.

Proposed resolution

Change

'form_options_attributes__select__options_attributes' => [
  'render element' => 'elements',
  'base hook' => 'select',
],

to

'form_options_attributes__select__options_attributes' => [
  'render element' => 'element',
  'base hook' => 'select',
],

Remaining tasks

Add steps to reproduce.

User interface changes

None

API changes

None

Data model changes

None