xbps/repositories/mirrors: add voidlinux.com.br/repo/

Author: abdeoliveira

src/xbps/repositories/mirrors/index.md

@@ -40,6 +40,7 @@ sub-repository.
 | <https://void.webconverger.org/>                   | Asia: Singapore   |
 | <https://mirror.aarnet.edu.au/pub/voidlinux/>      | AU: Canberra      |
 | <https://ftp.swin.edu.au/voidlinux/>               | AU: Melbourne     |
+| <https://voidlinux.com.br/repo/>                   | BR: Ouro Preto    |
 | <https://void.cijber.net/>                         | EU: Amsterdam, NL |
 | <http://ftp.dk.xemacs.org/voidlinux/>              | EU: Denmark       |
 | <https://mirrors.dotsrc.org/voidlinux/>            | EU: Denmark       |