Update PHPSERVER_VERSION

Author: natanfelles

src/server_config.php

@@ -18,7 +18,7 @@
         'max_execution_time' => 360,
     ],
     'server' => [
-        'PHPSERVER_VERSION' => '2.12',
+        'PHPSERVER_VERSION' => '2.12.1',
     ],
 ];