Revert "For now, use racket-nightly"
Revert "For now, use racket-nightly"

This reverts commit 91e6297800c92d778c0efc66534073c258d2a433.

krono/pycket,krono/pycket,cderici/pycket,cderici/pycket,krono/pycket,pycket/pycket,vishesh/pycket,pycket/pycket,cderici/pycket,magnusmorton/pycket,pycket/pycket,magnusmorton/pycket,samth/pycket,vishesh/pycket,vishesh/pycket,samth/pycket,magnusmorton/pycket,samth/pycket