Require C++23 in CMake config (#27)

Author: aobolensk

cmake/configure.cmake

@@ -4,7 +4,8 @@ foreach(CONFIG "" _DEBUG _RELEASE)
     set("CMAKE_RUNTIME_OUTPUT_DIRECTORY${CONFIG}" "${CMAKE_BINARY_DIR}/bin")
 endforeach()
 
-set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD 23)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 if(UNIX)
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -Wsign-compare -Werror")