[Merge] ~nteodosio/update-manager:cursor into update-manager:main

[Nathan Teodosio]

Nathan Teodosio has proposed merging ~nteodosio/update-manager:cursor into update-manager:main.

Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)
Related bugs:
  Bug #2054197 in update-manager (Ubuntu): "update-manager crashed with TypeError in _look_busy(): constructor returned NULL"
  https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/2054197

For more details, see:
https://code.launchpad.net/~nteodosio/update-manager/+git/update-manager/+merge/464333

Fix crash

  File "/usr/lib/python3/dist-packages/UpdateManager/UpdateManager.py", line 357, in _look_busy
    self.get_window().set_cursor(Gdk.Cursor.new(Gdk.CursorType.WATCH))
                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

believed to be caused by importing Gdk4 instead of Gtk3, c.f. LP:2054197 for more details.
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~nteodosio/update-manager:cursor into update-manager:main.
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