What's new in at-spi2-core 2.57.1:

* Fix several crashes introduced by the code to handle the accessibility
  bus going away.

* Add atspi_device_clear_key_grabs.

* Fix key grabs when num lock or caps lock are on under Wayland.

    atk-bridge: Don't crash when requesting a plug if not activated
    
* Have python overrides check DBus object paths when testing for equality.

* Add sanity checks for child indices received via DBus.