ci: prefer fling over dkP repo

fling has automated and transparent builds of their packages!
what more could you ask for?
8 jobs for master in 11 minutes and 20 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #604804933
3ds

00:01:35

passed #604804925
PC

00:02:01

passed #604804926
PC-sdl1

00:02:09

passed #604804930
Switch

00:04:08

passed #612597417
Wii

00:06:16

failed #640688406
WiiU

00:00:54

passed #604804941
Wii

00:05:53

passed #604804929
WiiU

00:04:09

 
Name Stage Failure
failed
WiiU Test
      [wiiu-fling]
Server = https://fling.heyquark.com

tee: /opt/devkitpro/pacman/etc/pacman.conf: No such file or directory
sudo: dkp-pacman: command not found
sudo: dkp-pacman: command not found
Running after_script
Uploading artifacts for failed job
ERROR: Job failed: exit code 1