Remove comment about AppVeyor in phpunit

Author: alexandre-daubois

phpunit

@@ -1,10 +1,6 @@
 #!/usr/bin/env php
 <?php
 
-// Cache-Id: 2021-05-27 20:30 UTC
-// For caching to work properly on appveyor, this file
-// must be exactly the same in all maintained branches
-
 if (!file_exists(__DIR__.'/vendor/symfony/phpunit-bridge/bin/simple-phpunit')) {
     echo "Unable to find the `simple-phpunit` script in `vendor/symfony/phpunit-bridge/bin/`.\nPlease run `composer update` before running this command.\n";
     exit(1);