General: bring in changes introduced in WordPress 5.3 (#13695)

Fixes #13694

See https://make.wordpress.org/core/2019/10/09/wp-5-3-introducing-the-spread-operator/

_inc/lib/class.jetpack-automatic-install-skin.php

@@ -65,8 +65,11 @@ public function get_main_error_message() {
 
 	/**
 	 * Overwrites the feedback function
+	 *
+	 * @param string|array|WP_Error $data    Data.
+	 * @param mixed                 ...$args Optional text replacements.
 	 */
-	public function feedback( $data ) {
+	public function feedback( $data, ...$args ) {
 
 		$current_error = null;
 		if ( is_wp_error( $data ) ) {
@@ -86,9 +89,6 @@ public function feedback( $data ) {
 		}
 
 		if ( strpos( $string, '%' ) !== false ) {
-			// phpcs:ignore PHPCompatibility.FunctionUse.ArgumentFunctionsReportCurrentValue.NeedsInspection
-			$args = func_get_args();
-			$args = array_splice( $args, 1 );
 			if ( ! empty( $args ) ) {
 				$string = vsprintf( $string, $args );
 			}