MSVC: Tolerate cxx_std_23 feature on older compiler versions

In commit 3aaf1d91bf (MSVC: C++20 final flag, C++23 support, 2021-05-29,
v3.20.4~7^2~1) we forgot to add `cxx_std_23` to the fallback table for
MSVC versions from VS 2010 through VS 2015.  This allows project to at
least attempt compilation with these compilers since they do not have
any modes.

Issue: #22729

Modules/Compiler/MSVC-CXX.cmake

@@ -70,6 +70,7 @@ elseif (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 16.0)
       cxx_std_14
       cxx_std_17
       cxx_std_20
+      cxx_std_23
       )
     _record_compiler_features(CXX "" CMAKE_CXX_COMPILE_FEATURES)
   endmacro()