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: Ic398c854a3da29dd9eac865aa8d2b44159669bfa
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
1 file changed