at-spi2-core: upgrade 2.56.3 -> 2.56.4

What's new in at-spi2-core 2.56.4:

* 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

* Add sanity checks for child indices received via DBus.

https://gitlab.gnome.org/GNOME/at-spi2-core/-/blob/2.56.4/NEWS?ref_type=tags

Comparing changes:
https://github.com/GNOME/at-spi2-core/compare/2.56.3...2.56.4

(From OE-Core rev: 59c9aa2411514f448cec23c0ceefeada2a103d85)

Signed-off-by: Tim Orling <tim.orling@konsulko.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-support/atk/at-spi2-core_2.56.4.bb

@@ -13,7 +13,7 @@ MAJ_VER = "${@oe.utils.trim_version("${PV}", 2)}"
 
 SRC_URI = "${GNOME_MIRROR}/${BPN}/${MAJ_VER}/${BPN}-${PV}.tar.xz"
 
-SRC_URI[sha256sum] = "0e41e1fc6a1961b38b4f9c0bea64bad30efff75949b7cdb988d2f2fdab72267a"
+SRC_URI[sha256sum] = "dbe35b951499e1d6f1fb552c2e0a09cea7cba2adf6c2eba0b2c85b6c094a3a02"
 
 DEPENDS = " \
 	dbus \