[5.4] Deprecate language string (#45564)

This deprecation was missed with #43147

Signed-off-by: BrianTeeman <[email protected]>

Author: brianteeman

administrator/language/en-GB/com_joomlaupdate.ini

@@ -202,6 +202,7 @@ COM_JOOMLAUPDATE_VIEW_DEFAULT_UPDATEFOUND="A Joomla update was found."
 COM_JOOMLAUPDATE_VIEW_DEFAULT_UPDATES_INFO_CUSTOM="You are on the "%s" update channel. This is not an official Joomla update channel."
 COM_JOOMLAUPDATE_VIEW_DEFAULT_UPDATES_INFO_DEFAULT="You are on the "%s" update channel. Through this channel you'll receive notifications for all updates of the current Joomla release (5.x)"
 COM_JOOMLAUPDATE_VIEW_DEFAULT_UPDATES_INFO_NEXT="You are on the "%s" update channel. Through this channel you will be notified when the future major release (6.x) will be available. Before upgrading to 6.x you'll need to assess its compatibility with your environment. You will not be notified about updates of the current Joomla release (5.x)."
+; Deprecated, will be removed with 6.0
 COM_JOOMLAUPDATE_VIEW_DEFAULT_UPDATES_INFO_TESTING="You are on the &quot;%s&quot; update channel. This channel is designed for testing new releases and fixes in Joomla.<br>It is only intended for JBS (Joomla Bug Squad&trade;) members and others within the Joomla community who are testing. Do not use this setting on a production site."
 COM_JOOMLAUPDATE_VIEW_DEFAULT_UPDATE_NOTICE="Before you update Joomla, ensure that the installed extensions are available for the new Joomla version. <br>You are strongly advised to make a <strong>backup</strong> of your site's files and database before you start updating."
 COM_JOOMLAUPDATE_VIEW_DEFAULT_UPLOAD_INTRO="You can use this feature to update Joomla if your server is behind a firewall or otherwise unable to contact the update servers. First download the Joomla <em><strong>Update Package</strong></em> in ZIP format from <a class='alert-link' href='%s' target='_blank' rel='noopener noreferrer'>the official Joomla download page</a>. Then use the fields below to upload and install it."