Move PHPUnit cache into the build directory

Author: Crell

phpunit.xml.dist

@@ -1,5 +1,13 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" bootstrap="vendor/autoload.php" backupGlobals="false" colors="true" processIsolation="false" stopOnFailure="false" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/12.1/phpunit.xsd" cacheDirectory=".phpunit.cache" backupStaticProperties="false">
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    bootstrap="vendor/autoload.php"
+    backupGlobals="false"
+    colors="true"
+    processIsolation="false"
+    stopOnFailure="false"
+    xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/12.1/phpunit.xsd"
+    cacheDirectory="build/phpunit.cache"
+    backupStaticProperties="false">
   <coverage>
     <report>
       <clover outputFile="build/logs/clover.xml"/>