use latest phpunit 12.x version

Author: Tobion

phpunit.xml

@@ -1,15 +1,15 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <phpunit
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/12.0/phpunit.xsd"
+    xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/12.5/phpunit.xsd"
     beStrictAboutTestsThatDoNotTestAnything = "true"
     beStrictAboutOutputDuringTests          = "true"
     colors                                  = "true"
     verbose                                 = "true"
     bootstrap                               = "vendor/autoload.php"
 >
     <php>
-        <env name="SYMFONY_PHPUNIT_VERSION" value="12.0" />
+        <env name="SYMFONY_PHPUNIT_VERSION" value="12.5" />
     </php>
 
     <testsuites>