Revert "Pin nightly toolchain used for miri job"
This reverts commit 9abad43a6a41495fb3798fb61467523f3ddf7c47.
D
David Tolnay committed
f30142312a0c45b84e28c8b98fdc81d9d7dadeac
Parent: 7a5fbc6
This reverts commit 9abad43a6a41495fb3798fb61467523f3ddf7c47.