Update the PHPUnit config.

Author: johnbillion

phpunit.xml.dist

@@ -1,4 +1,6 @@
+<?xml version="1.0"?>
 <phpunit
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	backupGlobals="false"
 	beStrictAboutOutputDuringTests="true"
 	beStrictAboutTestsThatDoNotTestAnything="true"
@@ -8,15 +10,16 @@
 	convertNoticesToExceptions="true"
 	convertWarningsToExceptions="true"
 	convertDeprecationsToExceptions="true"
+	xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd"
 >
 	<testsuites>
 		<testsuite name="main">
 			<directory suffix=".php">tests/phpunit</directory>
 		</testsuite>
 	</testsuites>
-	<filter>
-		<whitelist processUncoveredFilesFromWhitelist="true">
+	<coverage processUncoveredFiles="true">
+		<include>
 			<directory suffix=".php">src</directory>
-		</whitelist>
-	</filter>
+		</include>
+	</coverage>
 </phpunit>