[gnome-shell] (9 commits) Non-fast-forward update to branch wip/fmuellner/gtk4

[Florian Müllner <fmuellner src gnome org>]

The branch 'wip/fmuellner/gtk4' 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:

  f7cee13... wip: Port extensions app/portal to GTK4

Commits added to the branch:

  bfa3491... polkitAgent: Return GLib.SOURCE_REMOVE on timeout callback (*)
  f4d90bc... polkitAgent: Reset the session request timeout when removin (*)
  5ec5978... windowManager: Fix ngettext() call (*)
  b191e9e... authPrompt: Fix spinner alignment (*)
  300961e... Update zh_CN translations (*)
  6aa1b81... messageTray: Make NotificationPolicy properties read-only (*)
  be12c71... loginDialog: Get resource scale by get_resource_scale (*)
  6f881f2... test-theme: Check return value of chdir() (*)
  ad280bb... wip: Port extensions app/portal to GTK4

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