fmt: update fmt to 8.0.1
fmt: update fmt to 8.0.1

Summary:
In buck builds, fmt is at 8.0.1 which isn't entirely compatible with fmt 7 that
getdeps uses. Let's sync up the version.

Reviewed By: chadaustin

Differential Revision: D33832051

fbshipit-source-id: 7de71c4b675f220c0aa5b418c3466d65d78e9292

nodakai/watchman,facebook/watchman,nodakai/watchman,facebook/watchman,nodakai/watchman,facebook/watchman,nodakai/watchman,facebook/watchman,nodakai/watchman,nodakai/watchman,facebook/watchman,nodakai/watchman,facebook/watchman,facebook/watchman,facebook/watchman,nodakai/watchman,nodakai/watchman,facebook/watchman