Upgrade PHPUnit config

Author: arokettu

phpunit.xml.dist

@@ -3,18 +3,20 @@
          convertErrorsToExceptions="true"
          convertNoticesToExceptions="true"
          convertWarningsToExceptions="true"
-         bootstrap="./vendor/autoload.php">
+         bootstrap="./vendor/autoload.php"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd">
 
     <testsuites>
         <testsuite name="Test suite">
             <directory>./tests/</directory>
         </testsuite>
     </testsuites>
 
-    <filter>
-        <whitelist processUncoveredFilesFromWhitelist="true">
+    <coverage processUncoveredFiles="true">
+        <include>
             <directory suffix=".php">src</directory>
-        </whitelist>
-    </filter>
+        </include>
+    </coverage>
 
 </phpunit>