0.16.4

Bilal Elmoussaoui (4):
      gdk-pixbuf: Add PixbufAnimation subclassing support
      gdk-pixbuf: Correct PixbufAnimationIter definition
      gdk-pixbuf: Add PixbufAnimationIter subclassing support
      gdk-pixbuf: Add PixbufLoader subclassing support

Colin Walters (1):
      glib: Add a doc string for `as_ptr` generated impls

Jason Francis (2):
      glib: fix undefined behavior in types::register_type
      update windows CI to glib 2.74

Sebastian Dröge (3):
      glib: Document the value guarantees for `ObjectImpl::set_property()` and `property()`
      Update versions to 0.16.4