ci: Attempt to fix broken Windows CI

https://gitlab.freedesktop.org/nirbheek/orc/-/pipelines/169274

Update to latest image and use the gstreamer runner tag. Matches the
gst-ci template.

Also try to make MSYS2 CI more resilient by following:
https://github.com/msys2/setup-msys2/blob/master/main.js#L98

Part-of: <gstreamer/orc!42>
5 jobs for uwp-virtualallocfromapp in 5 minutes and 16 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #3378992
debian sid

00:01:05

passed #3379168
gstreamer-windows 1809 windows docker
msys2

00:03:41

passed #3378993
gstreamer-windows 1809 windows docker
vs2017 amd64

00:01:34

passed #3378994
gstreamer-windows 1809 windows docker
vs2017 x86

00:01:17

failed #3378995
gstreamer-windows 1809 windows docker
msys2

00:01:29