Update PHPUnit config from 6.2 to 9.5

phpunit_config_to_v9.php

<?php

$doc1 = new DOMDocument();
$doc1->load('dev/tests/integration/phpunit.xml');

$xmlToAdd = new DOMDocument();
$xmlToAdd->loadXML('<coverage>
    <exclude>
        <directory suffix=".php">../../../app/code/Magento</directory>
        <directory>../../../app/code/*/*/Test</directory>
        <directory>../../../app/code/*/*/Setup</directory>
        <directory suffix="registration.php">../../../app/code</directory>
    </exclude>
    <include>
        <directory>../../../app/code</directory>
    </include>
</coverage>');

/** @var DOMElement $phpunit */
$phpunit = $doc1->getElementsByTagName('phpunit')->item(0);

// Add code coverage section
$coverage = $xmlToAdd->getElementsByTagName('coverage')->item(0);
$copiedItem = $doc1->importNode($coverage, true);
$phpunit->appendChild($copiedItem);

// Remove filter section
$filterSection = $doc1->getElementsByTagName('filter')->item(0);
$phpunit->removeChild($filterSection);

// Attribute
$phpunit->removeAttribute('xsi:noNamespaceSchemaLocation');
$phpunit->setAttribute('xsi:noNamespaceSchemaLocation', 'http://schema.phpunit.de/9.5/phpunit.xsd');

$doc1->save('output.xml');