New warnings: `  'initializing': conversion from '__int64' to 'int', possible loss of data [D:\a\cpython\cpython\PCbuild\pythoncore.vcxproj]`

# Bug report

### Bug description:

Popped up in https://github.com/python/cpython/pull/123203/files

### CPython versions tested on:

CPython main branch

### Operating systems tested on:

Other


### Linked PRs
* gh-123206