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: Ie0245d2667cfb2917e1af6d57f82a1d20fef8d60
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/meson.build b/meson.build
index bc7730a..8e5a27d 100644
--- a/meson.build
+++ b/meson.build
@@ -1,11 +1,11 @@
 project(
     'phosphor-ledmanager', 'cpp',
     version : '1.0.0',
-    meson_version: '>=0.57.0',
+    meson_version: '>=1.1.1',
     default_options: [
         'warning_level=3',
         'werror=true',
-        'cpp_std=c++20',
+        'cpp_std=c++23',
         'buildtype=debugoptimized',
     ]
 )