Summary:
Changes in https://github.com/facebook/react-native/compare/7cece3423...189c2c895 broke build for Windows because of a conversion from size_t to int. Adds a static cast to int to fix the error and restore windows build
Error Message
```
##[error]node_modules\react-native\ReactCommon\react\renderer\core\RawPropsParser.cpp(100,42): Error C2220: the following warning is treated as an error
3>D:\a\_work\1\s\node_modules\react-native\ReactCommon\react\renderer\core\RawPropsParser.cpp(100,42): error C2220: the following warning is treated as an error [D:\a\_work\1\s\vnext\Microsoft.ReactNative\Microsoft.ReactNative.vcxproj]
##[warning]node_modules\react-native\ReactCommon\react\renderer\core\RawPropsParser.cpp(100,42): **Warning C4267: '=': conversion from 'size_t' to 'int', possible loss of data**
3>D:\a\_work\1\s\node_modules\react-native\ReactCommon\react\renderer\core\RawPropsParser.cpp(100,42): warning C4267: '=': conversion from 'size_t' to 'int', possible loss of data [D:\a\_work\1\s\vnext\Microsoft.ReactNative\Microsoft.ReactNative.vcxproj]
```
## Changelog
[General] [Fixed] - Restore Windows build with RawPropsParser.cpp
Pull Request resolved: https://github.com/facebook/react-native/pull/33432
Test Plan: Tested locally and changes pass in the react-native-windows pipeline, change is being merged into the main branch of react-native-windows.
Reviewed By: philIip
Differential Revision: D34907928
Pulled By: javache
fbshipit-source-id: 8b76cbef0b637f2d607a8aefd2998322c3245713