chore(psalm): Include cron.php into psalm checked files

Signed-off-by: Côme Chilliet <come.chilliet@nextcloud.com>

psalm.xml

@@ -45,6 +45,7 @@
 		<directory name="lib"/>
 		<directory name="ocs"/>
 		<directory name="ocs-provider"/>
+		<file name="cron.php"/>
 		<file name="index.php"/>
 		<file name="public.php"/>
 		<file name="remote.php"/>