gh-87512: Fix subprocess using timeout= on Windows blocking with a large input=#142058

gpshead merged 3 commits into

python:mainpython/cpython:mainfrom

gpshead:claude/fix-subprocess-windows-timeout-01YQBh24PZt4w9vhdqBQi6uWgpshead/cpython:claude/fix-subprocess-windows-timeout-01YQBh24PZt4w9vhdqBQi6uWCopy head branch name to clipboard