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: I16b29c5eb688a26df6c44d16f7f9bd8f5cd5b031
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/meson.build b/meson.build
index f6ce959..ff1b127 100644
--- a/meson.build
+++ b/meson.build
@@ -1,10 +1,10 @@
 # See README.md for details.
 project('openpower-hw-diags', 'cpp',
-        version: '0.1', meson_version: '>=0.58.0',
+        version: '0.1', meson_version: '>=1.1.1',
         default_options: [
           'warning_level=3',
           'werror=true',
-          'cpp_std=c++20',
+          'cpp_std=c++23',
         ])
 
 # Package directory root, which will contain required data files.