at-spi2-core: upgrade 2.44.1 -> 2.46.0

* Both atk and at-spi2-atk are now merged into this project.
  - drop atk_2.38.0.bb
  - drop at-spi2-atk_2.38.0.bb
  - PROVIDES += "atk at-spi2-atk"
  - RPROVIDES:${PN} += "atk at-spi2-atk"
* DEPENDS on libxml2
* Ships:
  ${libdir}/gnome-settings-daemon-3.0/gtk-modules/at-spi2-atk.desktop
  ${libdir}/gtk-2.0/modules/libatk-bridge.so

What's new in at-spi2-core 2.46.0:
* Fix GetInterfaces documentation on org.a11y.atspi.Accessible
  interface.

What's new in at-spi2-core 2.45.91:
* Send device event controller events using the same signature as other
  events.
* Document the Accessible, Action, and Cache dbus interfaces.
* Fix license of atspi-gmain.c (#87).

What's new in at-spi2-core 2.45.90:
* xml: Add some documentation.
* xml: Fix event arguments.
* xml: Add some missing DeviceEventController methods.
* Bind the AT-SPI bus to the graphical session.
* Mark bus service as belonging to the session slice.
* Add ATSPI_ROLE_PUSH_BUTTON_MENU.
* Add an "announcement" event/signal to allow objects to send
  notifications (!63).
* Various code clean-ups and test improvements.

What's new in at-spi2-core 2.45.1:
* Atk and at-spi2-atk are now merged into this project.
* Now requires meson 0.56.2 and glib 2.67.4.
* at-spi2-atk: Expose the accessible hierarchy via dbus introspection.
* Properly escape the AT-SPI bus address; fixes warnings about the
  address not containing a colon (!55).
* Add a text value to AtspiValue, so that a value can expose a textual
  description, as in the new Atk value API.
* Add atspi_event_listener_register_with_app, to allow an event listener
  to be registered only for a given application (!52).

https://gitlab.gnome.org/GNOME/at-spi2-core/-/blob/main/NEWS



Signed-off-by: Tim Orling <tim.orling@konsulko.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>