Updated phpunit configs to use new schema introduced in v9.3

phpunit-api.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <phpunit
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/8.5/phpunit.xsd"
+    xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.4/phpunit.xsd"
     bootstrap="./config/test/bootstrap_api_tests.php"
     colors="true"
 >
@@ -11,9 +11,9 @@
         </testsuite>
     </testsuites>
 
-    <filter>
-        <whitelist processUncoveredFilesFromWhitelist="true">
+    <coverage processUncoveredFiles="true">
+        <include>
             <directory suffix=".php">./module/*/src</directory>
-        </whitelist>
-    </filter>
+        </include>
+    </coverage>
 </phpunit>