build: compile with C++20 support on Windows

Our Linux build infra is not ready for it yet,
but V8 is making it difficult to compile on Windows
without it.

Refs: #45402
PR-URL: #52465
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
Reviewed-By: Michael Dawson <midawson@redhat.com>

common.gypi

@@ -286,7 +286,8 @@
       'VCCLCompilerTool': {
         'AdditionalOptions': [
           '/Zc:__cplusplus',
-          '-std:c++17'
+          # The following option enables c++20 on Windows. This is needed for V8 v12.4+
+          '-std:c++20',
         ],
         'BufferSecurityCheck': 'true',
         'DebugInformationFormat': 1,          # /Z7 embed info in .obj files