Add Behat\Gherkin\Node\TableNode namespace for instanceof TableNode

At line 67, we currently check `instanceof Tablenode`, but since the class isn't introduced with `use` we check for `instanceof Drupal\DrupalExtension\Context` which doesn't exist.

This fixes that (but still doesn't quite fix transforming random tokens in TableNode values).

Author: xurizaemon

src/Drupal/DrupalExtension/Context/RandomContext.php

@@ -3,6 +3,7 @@
 namespace Drupal\DrupalExtension\Context;
 
 use Behat\Behat\Hook\Scope\ScenarioScope;
+use Behat\Gherkin\Node\TableNode;
 
 /**
  * Class RandomContext