Remove terminated mirror

Author: fauust

server/clients-and-utilities/server-client-software/download/mirror-sites-for-mariadb.md

@@ -332,10 +332,6 @@ Other mirrors (list not necessarily complete) are listed below and can be select
 - Distrohub (Kyiv)
 - mirohost.net (Kyiv)
 
-### United Kingdom
-
-- Starburst Hosting (Portsmouth)
-
 ### The United States of America (USA)
 
 - Accretive Networks (Washington, Seattle)