[5.x] Update files_joomla.sys.ini

[jgerman-bot]

New language relevant PR in upstream repo: joomla/joomla-cms#40771 Here are the upstream changes:

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diff --git a/language/en-GB/files_joomla.sys.ini b/language/en-GB/files_joomla.sys.ini
index ed17d91d7184..f575132b76be 100644
--- a/language/en-GB/files_joomla.sys.ini
+++ b/language/en-GB/files_joomla.sys.ini
@@ -6,4 +6,4 @@
 FILES_JOOMLA="Joomla CMS"
 FILES_JOOMLA_ERROR_FILE_FOLDER="Error on deleting file or folder %s"
 FILES_JOOMLA_ERROR_MANIFEST="Error on updating manifest cache: (type, element, folder, client) = (%s, %s, %s, %s)"
-FILES_JOOMLA_XML_DESCRIPTION="Joomla! 4 Content Management System."
+FILES_JOOMLA_XML_DESCRIPTION="Joomla! 5 Content Management System."