Coding Standards: Remove unused variables in `WP_Comment_Query`.

* `$unapproved_ids` and `$unapproved_emails` in `WP_Comment_Query::get_comment_ids()` were added in [29965] and appear to never have been used.
* `$wpdb` in `WP_Comment_Query::fill_descendants()` was replaced with `$this->db` in [38275], removed in [38446], and accidentally reinstated in [38768].

Follow-up to [29965], [34546], [37625], [38275], [38446], [38768], [44546].

Props upadalavipul, dingo_d, audrasjb, SergeyBiryukov.
Fixes #57482.
Built from https://develop.svn.wordpress.org/trunk@55559


git-svn-id: http://core.svn.wordpress.org/trunk@55071 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-comment-query.php

@@ -584,8 +584,6 @@ class WP_Comment_Query {
 		if ( ! empty( $this->query_vars['include_unapproved'] ) ) {
 			$include_unapproved = wp_parse_list( $this->query_vars['include_unapproved'] );
 
-			$unapproved_ids    = array();
-			$unapproved_emails = array();
 			foreach ( $include_unapproved as $unapproved_identifier ) {
 				// Numeric values are assumed to be user IDs.
 				if ( is_numeric( $unapproved_identifier ) ) {
@@ -1013,14 +1011,10 @@ class WP_Comment_Query {
 	 *
 	 * @since 4.4.0
 	 *
-	 * @global wpdb $wpdb WordPress database abstraction object.
-	 *
 	 * @param WP_Comment[] $comments Array of top-level comments whose descendants should be filled in.
 	 * @return array
 	 */
 	protected function fill_descendants( $comments ) {
-		global $wpdb;
-
 		$levels = array(
 			0 => wp_list_pluck( $comments, 'comment_ID' ),
 		);

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.3-alpha-55558';
+$wp_version = '6.3-alpha-55559';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.