Update phpunit xml file to compatible with v11

Author: satrun77

phpunit.xml.dist

@@ -1,16 +1,14 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<phpunit bootstrap="vendor/silverstripe/framework/tests/bootstrap.php" colors="true">
-    <testsuites>
-        <testsuite name="Default">
-            <directory>tests</directory>
-        </testsuite>
-    </testsuites>
-    <filter>
-        <whitelist addUncoveredFilesFromWhitelist="true">
-            <directory suffix=".php">src/</directory>
-            <exclude>
-                <directory suffix=".php">tests/</directory>
-            </exclude>
-        </whitelist>
-    </filter>
+<?xml version="1.0"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" bootstrap="vendor/silverstripe/cms/tests/bootstrap.php" colors="true" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/11.5/phpunit.xsd">
+  <testsuite name="Default">
+    <directory>tests/</directory>
+  </testsuite>
+  <source>
+    <include>
+      <directory suffix=".php">src/</directory>
+    </include>
+    <exclude>
+      <directory suffix=".php">tests/</directory>
+    </exclude>
+  </source>
 </phpunit>