Use binary wheels for Windows installer deps

[ichwars]

Summary

• require binary wheels when installing dependencies into the Windows embeddable Python runtime
• update greenlet from 3.2.5 to 3.3.2 in both lockfiles so CPython 3.13 Windows wheels are available
• document the release-candidate packaging fix in the changelog

Why

The v1.2.6rc3 Windows Installer run verified the signed tag successfully, then failed while staging installer artifacts because greenlet 3.2.5 fell back to an sdist build against the Python embeddable distribution:

src/greenlet/greenlet.cpp(16): fatal error C1083: Cannot open include file: 'Python.h': No such file or directory
ERROR: Failed building wheel for greenlet

The embeddable distribution intentionally does not ship headers, so installer dependency staging should use prebuilt wheels only.

Verification

• git diff --check
• downloaded greenlet==3.3.2 as cp313-cp313-win_amd64 with --only-binary=:all:
• verified that the downloaded Windows wheel SHA-256 is present in both lockfiles

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