fix: add missing CITestStreamFilter::addErrorFilter()

Author: kenjis

src/Test/MockInputOutput.php

@@ -53,6 +53,7 @@ public function prompt(string $field, $options = null, $validation = null): stri
 
         CITestStreamFilter::registration();
         CITestStreamFilter::addOutputFilter();
+        CITestStreamFilter::addErrorFilter();
 
         PhpStreamWrapper::register();
         PhpStreamWrapper::setContent($input);