[arch-mirrors] leaseweb.net mirror URLs changed and new locations added

Hi, The leaseweb.net tier 1 mirrors have changed their URLs and some new locations have been added. Admins that sync from a leaseweb mirror, please update your source URL to reflect the change. The old URLs will continue to be available for "some time". The new URLs can be found here: https://www.archlinux.org/mirrors/leaseweb.net/ Florian