Merge pull request ceph#64426 from tchaikov/wip-cxx-23

cmake: upgrade CMAKE_CXX_STANDARD from 20 to 23

Reviewed-by: Ilya Dryomov <[email protected]>

Author: tchaikov

src/CMakeLists.txt

@@ -241,8 +241,8 @@ if(HAVE_INTEL)
   endif()
 endif()
 
-# require c++20
-set(CMAKE_CXX_STANDARD 20)
+# require c++23
+set(CMAKE_CXX_STANDARD 23)
 set(CMAKE_CXX_EXTENSIONS OFF)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_C_STANDARD 99)