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>
diff --git a/meson.build b/meson.build
index fbd3ec0..e1251a8 100644
--- a/meson.build
+++ b/meson.build
@@ -1,10 +1,10 @@
 project('phosphor-settingsd', 'cpp',
   version: '1.0',
-  meson_version: '>=0.58.0',
+  meson_version: '>=1.1.1',
   default_options: [
     'warning_level=3',
     'werror=true',
-    'cpp_std=c++20',
+    'cpp_std=c++23',
   ]
 )
 cpp = meson.get_compiler('cpp')