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: I9f33544802e29091009dfc7c43ec2ae43d4958e9
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/meson.build b/meson.build
index 0365a2b..d4b8fe7 100644
--- a/meson.build
+++ b/meson.build
@@ -6,7 +6,7 @@
   default_options: [
     'b_ndebug=if-release',
     'cpp_rtti=false',
-    'cpp_std=c++20',
+    'cpp_std=c++23',
     'warning_level=3',
     'werror=true',
   ]