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: Ibb8913a93032d388399b65904013e284780dad70
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/subprojects/dhcp-done/meson.build b/subprojects/dhcp-done/meson.build
index 2ee0826..abc449c 100644
--- a/subprojects/dhcp-done/meson.build
+++ b/subprojects/dhcp-done/meson.build
@@ -16,11 +16,11 @@
   'dhcp-done',
   'cpp',
   version: '0.1',
-  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',
   ],
 )