Update PHPUnit schema to 11.5

Author: Rafikooo

phpunit.xml.dist

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/10.5/phpunit.xsd"
+         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/11.5/phpunit.xsd"
          colors="true"
          bootstrap="tests/Application/config/bootstrap.php"
          defaultTestSuite="SyliusMailerBundle Test Suite"