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: I897133dfa2ee421145e541e6e4309a3c2fa60f2a
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
1 file changed