Merge branch '6.4' into 7.1

* 6.4:
  [Validator] Fix 58691 (missing plural-options in serbian language translation)
  profiler form data collector extart value property if it is setted
  [Process] Fix escaping /X arguments on Windows
  [Config] Handle Phar absolute path in `FileLocator`
  [Runtime] Remove unused `SKIPIF` from `dotenv_overload.phpt`

Author: nicolas-grekas

Tests/phpt/dotenv_overload.phpt

@@ -1,7 +1,5 @@
 --TEST--
 Test Dotenv overload
---SKIPIF--
-<?php require dirname(__DIR__, 6).'/vendor/autoload.php'; if (4 > (new \ReflectionMethod(\Symfony\Component\Dotenv\Dotenv::class, 'bootEnv'))->getNumberOfParameters()) die('Skip because Dotenv version is too low');
 --INI--
 display_errors=1
 --FILE--