Use of "static" in callables is deprecated

Problem/Motivation

When using the module with PHP 8.2, the following warning is displayed on the template management page:

Deprecated: Use of "static" in callables is deprecated in /web/modules/contrib/wysiwyg_template/src/Entity/Template.php on line 178

Steps to reproduce

1. Have PHP 8.2 installed.
2. Checkout the latest code from the 3.x branch.
3. Optionally, install Drupal 10 and apply the patch from https://www.drupal.org/project/wysiwyg_template/issues/3354588 💬 Drupal 10 compatible release Needs review that will make the module compatible with Drupal 10.
4. Enable the module.
5. Go to /admin/config/content/wysiwyg-templates and see that the warning is displayed.

Proposed resolution

Current code:

uasort($entities, 'static::sort');

Proposed code:

uasort($entities, static::class . '::sort');