[gimp] (2 commits) Non-fast-forward update to branch wip/Jehan/testing-msys2-win-CI

[Jehan <jehanp src gnome org>]

The branch 'wip/Jehan/testing-msys2-win-CI' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  562ce33... build: use msys2 packages as source for the Windows CI.
  9695ebf... gitlab-ci: remove useless build dependencies.

Commits added to the branch:

  8398c83... build: use msys2 packages as source for the Windows CI.
  e1a1150... gitlab-ci: remove useless build dependencies.