[pygobject] (9 commits) Non-fast-forward update to branch tree-model-sort-new-overrides

[Christoph Reiter <creiter src gnome org>]

The branch 'tree-model-sort-new-overrides' 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:

  0b1ff4d... Gtk overrides: make sure TreeModelSort.new_with_model and T

Commits added to the branch:

  43cf6c1... release (*)
  aa34108... version bump (*)
  67bd7e7... Add .mypy_cache to .gitignore (*)
  97024e5... Remove Python 2 support (*)
  dae0500... tests: don't use strict mode for xfail with the excepthook  (*)
  2a1c627... gtk overrides: Drop ToolButton for Gtk4 (*)
  f3248b7... gtk overrides: Drop Gtk.main for Gtk4 (*)
  9f50957... tests: Add a Gtk4 test for drag and drop operations (*)
  9cdbc56... Gtk overrides: make sure TreeModelSort.new_with_model and T

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