Editor: Replace `id` attribute with `class` in `WP_Font_Face::get_style_element()`.

`wp_print_font_faces()` prints an HTML tag that can be used more than once, so the document could end up having multiple tags with the same `id` attribute.

The `id` global attribute defines an identifier (ID) which must be unique in the whole document.

Reference: [https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/id MDN Web Docs: id].

Follow-up to [56500].

Props mmaattiiaass, peterwilsoncc.
Fixes #62246.
Built from https://develop.svn.wordpress.org/trunk@59259


git-svn-id: http://core.svn.wordpress.org/trunk@58651 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/fonts/class-wp-font-face.php

@@ -229,7 +229,7 @@ class WP_Font_Face {
 	private function get_style_element() {
 		$attributes = $this->generate_style_element_attributes();
 
-		return "<style id='wp-fonts-local'{$attributes}>\n%s\n</style>\n";
+		return "<style class='wp-fonts-local'{$attributes}>\n%s\n</style>\n";
 	}
 
 	/**

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.7-beta3-59258';
+$wp_version = '6.7-beta3-59259';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.