Migrate phpunit.xml config

Author: omalizadeh

.gitignore

@@ -1,5 +1,6 @@
 /.idea
 /.vscode
+/.phpunit.cache
 /vendor
 .php-cs-fixer.cache
 .phpunit.result.cache

phpunit.xml

@@ -1,15 +1,13 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit backupGlobals="false"
-         backupStaticAttributes="false"
-         convertDeprecationsToExceptions="true"
-         convertErrorsToExceptions="true"
-         convertNoticesToExceptions="true"
-         convertWarningsToExceptions="true"
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.1/phpunit.xsd"
+         backupGlobals="false"
          processIsolation="false"
          bootstrap="vendor/autoload.php"
          colors="true"
          stopOnFailure="false"
->
+         cacheDirectory=".phpunit.cache"
+         backupStaticProperties="false">
     <testsuites>
         <testsuite name="Multi Payment Test Suite">
             <directory suffix="Test.php">./tests</directory>