add cmake_policy

Author: Creeper19472

src/serious_python_windows/windows/CMakeLists.txt

@@ -11,6 +11,7 @@ project(${PROJECT_NAME} LANGUAGES CXX)
 # Explicitly opt in to modern CMake behaviors to avoid warnings with recent
 # versions of CMake.
 cmake_policy(VERSION 3.14...3.25)
+cmake_policy(SET CMP0063 NEW)
 
 # This value is used when generating builds using this plugin, so it must
 # not be changed