fix: phpstan issues

Author: shawnhooper

src/Comment_Command.php

@@ -791,10 +791,8 @@ static function ( $id ) use ( $exclude_list ) {
 
 	/**
 	 * Gets all available comment IDs.
-	 *
-	 * @return array Array of comment IDs.
 	 */
-	private function get_all_comment_ids() {
+	private function get_all_comment_ids(): array {
 		$query    = new WP_Comment_Query();
 		$comments = $query->query(
 			array(