Fix "mb_convert_encoding(): Handling HTML entities via mbstring is deprecated" warning with PHP 8.2

Problem/Motivation

When using PHP 8.2, the following warning is displayed repeatedly:

Deprecated: mb_convert_encoding(): Handling HTML entities via mbstring is deprecated; use htmlspecialchars, htmlentities, or mb_encode_numericentity/mb_decode_numericentity instead in /var/www/html/docroot/modules/contrib/media_link_enhancements/src/MediaLinkEnhancementsAlterLinks.php on line 98

Steps to reproduce

Install version 1.0.4 on a Drupal site with PHP 8.2 and go to any page.

Proposed resolution

Switch from using mb_convert_encoding to use htmlspecialchars, htmlentities, or mb_encode_numericentity/mb_decode_numericentity instead.

Remaining tasks

Make PR with fix.

User interface changes

None.

API changes

None.

Data model changes

None.