Revert "Update vendored React" (#46861)
Reverting temporarily as this breaks turbopack support for app dir
x-ref:
https://github.com/vercel/next.js/actions/runs/4349458918/jobs/7600147372
x-ref:
https://github.com/vercel/next.js/actions/runs/4349607013/jobs/7600148420
Reverts vercel/next.js#46826
