Update Rector paths to include parent directory for PHP 7.4 downgrade configuration

Author: georgedeploy

rector/toPhp7.4.php

@@ -8,7 +8,7 @@
 return static function (RectorConfig $rectorConfig): void {
     // We will process code in this specific directory during CI
     $rectorConfig->paths([
-        __DIR__,
+        __DIR__ . '/../',
     ]);
 
     // Downgrade rules to make code compatible with PHP 7.2