diff -r be944660c56a -r 3d72ae0968f4 wp/wp-admin/includes/class-wp-ajax-upgrader-skin.php
--- a/wp/wp-admin/includes/class-wp-ajax-upgrader-skin.php	Wed Sep 21 18:19:35 2022 +0200
+++ b/wp/wp-admin/includes/class-wp-ajax-upgrader-skin.php	Tue Sep 27 16:37:53 2022 +0200
@@ -121,17 +121,18 @@
 	 * @since 4.6.0
 	 * @since 5.3.0 Formalized the existing `...$args` parameter by adding it
 	 *              to the function signature.
+	 * @since 5.9.0 Renamed `$data` to `$feedback` for PHP 8 named parameter support.
 	 *
-	 * @param string|array|WP_Error $data    Message data.
-	 * @param mixed                 ...$args Optional text replacements.
+	 * @param string|array|WP_Error $feedback Message data.
+	 * @param mixed                 ...$args  Optional text replacements.
 	 */
-	public function feedback( $data, ...$args ) {
-		if ( is_wp_error( $data ) ) {
-			foreach ( $data->get_error_codes() as $error_code ) {
-				$this->errors->add( $error_code, $data->get_error_message( $error_code ), $data->get_error_data( $error_code ) );
+	public function feedback( $feedback, ...$args ) {
+		if ( is_wp_error( $feedback ) ) {
+			foreach ( $feedback->get_error_codes() as $error_code ) {
+				$this->errors->add( $error_code, $feedback->get_error_message( $error_code ), $feedback->get_error_data( $error_code ) );
 			}
 		}
 
-		parent::feedback( $data, ...$args );
+		parent::feedback( $feedback, ...$args );
 	}
 }