mirrors: update list and repo size

download.nus.edu.sg lost rsync support, so down to T2
fastmirror.pp.ua is temporarily gone, but not clear if it will come back
mirror2.sandyriver.net is gone now as it didn't play well in CI

web/dev/mirrors.md

@@ -29,7 +29,6 @@ support (\*), HTTPS support, synced at least once per day from the primary serve
 | Name | URLs  |  Note |
 | -    | -     | -     |
 | mirror.umd.edu | [HTTPS](https://mirror.umd.edu/msys2/) \| [RSYNC](rsync://mirror.umd.edu/msys2/) | [website](https://mirror.umd.edu/)|
-| download.nus.edu.sg | [HTTPS](https://download.nus.edu.sg/mirror/msys2/) \| [RSYNC](rsync://download.nus.edu.sg/msys2/) | <download@nus.edu.sg> |
 | ftp.acc.umu.se | [HTTPS](https://ftp.acc.umu.se/mirror/msys2.org/) \| [RSYNC](rsync://ftp.acc.umu.se/mirror/msys2.org/) | <ftp-adm@acc.umu.se> |
 | ftp.nluug.nl | [HTTPS](https://ftp.nluug.nl/pub/os/windows/msys2/builds/) \| [RSYNC](rsync://ftp.nluug.nl/msys2/builds/) | <ftp-admin@nluug.nl> |
 | ftp.osuosl.org | [HTTPS](https://ftp.osuosl.org/pub/msys2/) \| [RSYNC](rsync://rsync.osuosl.org/msys2/) | <hosting-request@osuosl.org> | |
@@ -54,8 +53,6 @@ support (\*), HTTPS support, synced at least once per day from the primary serve
 
 | Name | URLs  | Note    |
 | -    | -     | -       |
-| fastmirror.pp.ua | [HTTPS](https://fastmirror.pp.ua/msys2/) \| [RSYNC](rsync://fastmirror.pp.ua/msys2/) | [website](https://fastmirror.pp.ua) - too slow for T1 |
-| mirror2.sandyriver.net | [HTTPS](https://mirror2.sandyriver.net/pub/software/msys2/) \| [RSYNC](rsync://mirror2.sandyriver.net/pub/software/msys2/) | [issue](https://github.com/msys2/msys2.github.io/issues/196) - flaky in CI |
 | ftp.cc.uoc.gr | [HTTPS](https://ftp.cc.uoc.gr/mirrors/msys2/) | <mirrors@cc.uoc.gr> |
 | mirrors.bit.edu.cn | [HTTPS](https://mirrors.bit.edu.cn/msys2/) | <webmaster@bitnp.net> |
 | mirror.jmu.edu | [HTTPS](https://mirror.jmu.edu/pub/msys2/) | <mirrormaster@jmu.edu> |
@@ -67,10 +64,11 @@ support (\*), HTTPS support, synced at least once per day from the primary serve
 | mirror.iscas.ac.cn | [HTTPS](https://mirror.iscas.ac.cn/msys2/) | |
 | mirrors.tencent.com | [HTTPS](https://mirrors.tencent.com/msys2/) | <petzhou@tencent.com> |
 | mirror.ufro.cl | [HTTPS](https://mirror.ufro.cl/msys2/) | [Jonathan Gutiérrez](mailto:jonathan.gutierrez@ufrontera.cl) |
+| download.nus.edu.sg | [HTTPS](https://download.nus.edu.sg/mirror/msys2/) | <download@nus.edu.sg> |
 
 ## Adding a New Mirror
 
-The repository size is ~550 GiB (see https://mirror.jmu.edu/ for current stats)
+The repository size is ~725 GiB (see https://mirror.jmu.edu/ for current stats)
 with the distribution of sizes like this:
 
 ```