Bump PHPUnit xml schema to version 9.5

Author: DigiLive

phpunit.xml

@@ -3,7 +3,7 @@
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     colors="true"
     bootstrap="vendor/autoload.php"
-    xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd">
+    xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.5/phpunit.xsd">
   <coverage includeUncoveredFiles="true">
     <include>
       <directory>./lib</directory>