[gtk] (5 commits) Non-fast-forward update to branch mcatanzaro/unparent-warning

[Michael Catanzaro <mcatanzaro src gnome org>]

The branch 'mcatanzaro/unparent-warning' 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:

  9fa6d9b... Add warning when widget with no parent is unparented
  10ec545... listbox: unparent new header only if it has a parent

Commits added to the branch:

  87e0a28... ci: Specify `only` for other jobs (*)
  195b98f... ci: Only run macOS job on upstream branches (*)
  e930a20... Merge branch 'ebassi/ci-only' into 'master' (*)
  db05984... Add warning when widget with no parent is unparented
  b263487... listbox: unparent new header only if it has a parent

(*) This commit already existed in another branch; no separate mail sent