[3.13] gh-124628: Pyrepl inputs on Windows shouldn't always be blocking reads (GH-124629) (#124638)

gh-124628: Pyrepl inputs on Windows shouldn't always be blocking reads (GH-124629)
(cherry picked from commit 83e5dc0f4d0d8d71288f162840b36f210fb03abf)

Co-authored-by: Dino Viehland <dinoviehland@meta.com>