Hello,

I have uploaded at-spi2-core/2.56.2-1+deb13u2 as proposed trixie update.

[ Reason ]
We would like to upload the attached changes to trixie to fix the usage
of the atkversion.h header in C++ (not a regression).

[ Impact ]
In Trixie (and before), C++ programs cannot use functions from
atkversion.h because it does not include the extern "C" { } marker. This
poses problem for building on Trixie accessibility tools that need to
adapt to different versions of atk.

[ Tests ]
This was tested manually.

[ Risks ]
The code change is very trivial.

[ Checklist ]
  [X] *all* changes are documented in the d/changelog
  [X] I reviewed all changes and I approve them
  [X] attach debdiff against the package in (old)stable
  [X] the issue is verified as fixed in unstable

[ Changes ]
This just adds the glib-standard G_BEGIN_DECLS G_END_DECLS calls, like
done upstream
https://gitlab.gnome.org/GNOME/at-spi2-core/-/merge_requests/219