functionMap: fix return type of Phar::offsetGet()

this is incorrectly written as int on php.net.

src/Reflection/SignatureMap/functionMap.php

@@ -8650,7 +8650,7 @@
 'Phar::mount' => ['void', 'pharpath'=>'string', 'externalpath'=>'string'],
 'Phar::mungServer' => ['', 'munglist'=>'array'],
 'Phar::offsetExists' => ['bool', 'offset'=>'string'],
-'Phar::offsetGet' => ['int', 'offset'=>'string'],
+'Phar::offsetGet' => ['PharFileInfo', 'offset'=>'string'],
 'Phar::offsetSet' => ['', 'offset'=>'string', 'value'=>'string'],
 'Phar::offsetUnset' => ['bool', 'offset'=>'string'],
 'Phar::running' => ['string', 'retphar='=>'bool'],