ReturnToYieldFromFixer error on file-wide return

[juliangut]

Bug report

Description

When run in files simply returning arrays, such as configuration files, shouldBeFixed method errors in the process of detecting the end of the array: https://github.com/PHP-CS-Fixer/PHP-CS-Fixer/blob/master/src/Fixer/ArrayNotation/ReturnToYieldFromFixer.php#L85

The next thing in the file is the end of it but the fixer assumes there should be something else (assumes the return is inside a method/function) when actually in this case the tokens index is null and the expression fails with "Illegal offset type"

Simply checking $functionEndIndex !== null should fix the problem

Runtime version

PHP CS Fixer 3.28.0 Jump & Run by Fabien Potencier and Dariusz Ruminski.
PHP runtime: 8.2.10

Code snippet that reproduces the problem

<?php
return [
     static function() { return []; ),
];