REDSHOP-6200 Update Joomla version 3.9.23

RoboFile.php

@@ -64,7 +64,7 @@ public function testsSitePreparation($use_htaccess = 1, $cleanUp = 1)
 			* When joomla Staging branch has a bug you can uncomment the following line as a tmp fix for the tests layer.
 			* Use as $version value the latest tagged stable version at: https://github.com/joomla/joomla-cms/releases
 			*/
-			$version = '3.9.22';
+			$version = '3.9.23';
 
 			$this->_exec("git clone -b $version --single-branch --depth 1 https://github.com/joomla/joomla-cms.git tests/joomla-cms");
 			$this->say("Joomla CMS ($version) site created at tests/joomla-cms");