[Bug 2080989] [NEW] Port to Gtk4

[Fred]

Public bug reported:

Port update-manager from GTK 3 to GTK 4.

https://docs.gtk.org/gtk4/migrating-3to4.html

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2080989

Title:
  Port to Gtk4

Status in update-manager package in Ubuntu:
  New

Bug description:
  Port update-manager from GTK 3 to GTK 4.

  https://docs.gtk.org/gtk4/migrating-3to4.html

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