fix error with phpunit10 (migrate configuration)

 Produced by: phpunit --migrate-configuration

Author: tenzap

tests/phpunit.xml

@@ -1,15 +1,16 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" bootstrap="./Bootstrap.php" colors="true" convertNoticesToExceptions="true" convertWarningsToExceptions="true" stopOnError="false" stopOnFailure="false" stopOnIncomplete="false" stopOnSkipped="false" beStrictAboutTestsThatDoNotTestAnything="false" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd">
-  <coverage>
-    <include>
-      <directory suffix=".php">../system/</directory>
-    </include>
-  </coverage>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" bootstrap="./Bootstrap.php" colors="true" stopOnError="false" stopOnFailure="false" stopOnIncomplete="false" stopOnSkipped="false" beStrictAboutTestsThatDoNotTestAnything="false" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.2/phpunit.xsd" cacheDirectory=".phpunit.cache">
+  <coverage/>
   <testsuites>
     <testsuite name="CodeIgniter Core Test Suite">
       <directory suffix="test.php">./codeigniter/core</directory>
       <directory suffix="test.php">./codeigniter/helpers</directory>
       <directory suffix="test.php">./codeigniter/libraries</directory>
     </testsuite>
   </testsuites>
+  <source>
+    <include>
+      <directory suffix=".php">../system/</directory>
+    </include>
+  </source>
 </phpunit>