What's new in at-spi2-core 2.53.1:
* tests: Clean up test application on SIGABRT/SIGSEGV.
* Set (allow-none) for nullable parameters to atspi_match_rule_new.
* collection: Allow specifying specific action names in match rules.
atk-adaptor: Fix duplicated results in GetMatchesFrom.
* atk-adaptor: For collections, don't return objects with 0 actions as
supporting AtkAction.
* Rename ATSPI_ROLE_PUSH_BUTTON to ATSPI_ROLE_BUTTON.