build: upgrade to C++23

Meson 1.1.1 and GCC-13 both support C++23 and a sufficient portion of
the standard has been implemented.  Upgrade the build to leverage it.

Change-Id: I9ea3416a29d8c921871c06984f8e05f12a7dbb03
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
1 file changed