Update phpunit config

phpunit.xml.dist

@@ -1,33 +1,20 @@
 <?xml version="1.0" encoding="UTF-8"?>
-
-<phpunit backupGlobals="false"
-         backupStaticAttributes="false"
-         colors="true"
-         convertErrorsToExceptions="true"
-         convertNoticesToExceptions="true"
-         convertWarningsToExceptions="true"
-         processIsolation="false"
-         stopOnFailure="false"
-         bootstrap="vendor/autoload.php"
->
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" backupGlobals="false" backupStaticAttributes="false" colors="true" convertErrorsToExceptions="true" convertNoticesToExceptions="true" convertWarningsToExceptions="true" processIsolation="false" stopOnFailure="false" bootstrap="vendor/autoload.php" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd">
   <testsuites>
     <testsuite name="Twig Test Suite">
       <directory>./tests/</directory>
     </testsuite>
   </testsuites>
-
   <php>
     <ini name="error_reporting" value="-1" />
     <ini name="xdebug.overload_var_dump" value="0" />
   </php>
-
   <listeners>
     <listener class="Symfony\Bridge\PhpUnit\SymfonyTestsListener" />
   </listeners>
-
-  <filter>
-    <whitelist>
+  <coverage>
+    <include>
       <directory suffix=".php">./src/</directory>
-    </whitelist>
-  </filter>
+    </include>
+  </coverage>
 </phpunit>