fix: PHPUnit test Process() format

\Symfony\Component\Process\Process needs to be passed an array
instead of a string for the command to run, in order to sanitize
the input properly

tests/PhpWord/_includes/AbstractWebServerEmbeddedTest.php

@@ -26,7 +26,7 @@ abstract class AbstractWebServerEmbeddedTest extends \PHPUnit\Framework\TestCase
  public static function setUpBeforeClass()
  {
  if (self::isBuiltinServerSupported()) {
- self::$httpServer = new Process('php -S localhost:8080 -t tests/PhpWord/_files');
+ self::$httpServer = new Process(explode(' ', 'php -S localhost:8080 -t tests/PhpWord/_files'));
  self::$httpServer->start();
  while (!self::$httpServer->isRunning()) {
  usleep(1000);