Update NodeNormalizer.php

Changed `implode` call to be compatible with php 8.0.

Author: blibio

src/PHPCR/Shell/Serializer/NodeNormalizer.php

@@ -158,7 +158,7 @@ public function denormalize($data, $class, $format = null, array $context = [])
         if (count($errors) > 0) {
             throw new InvalidArgumentException(sprintf(
                 'Errors encountered during denormalization: %s',
-                implode($errors, "\n")
+                implode("\n", $errors)
             ));
         }
     }