Upgrade npm dependencies of flow-upgrade
Upgrade npm dependencies of flow-upgrade

Summary: Apparently some old versions of some dependencies had security issues (see attached tasks). Upgrade the dependencies using `yarn upgrade`.

Reviewed By: gabelevi

Differential Revision: D17550866

fbshipit-source-id: fcd5f1c0d5290e1df7fc6e9796e468728ce406aa

samwgoldman/flow,mroch/flow,mroch/flow,gabelevi/flow,facebook/flow,samwgoldman/flow,mroch/flow,facebook/flow,samwgoldman/flow,facebook/flow,gabelevi/flow,gabelevi/flow,gabelevi/flow,facebook/flow,facebook/flow,samwgoldman/flow,samwgoldman/flow,facebook/flow,gabelevi/flow,gabelevi/flow,samwgoldman/flow,mroch/flow,samwgoldman/flow,mroch/flow,mroch/flow,mroch/flow,gabelevi/flow,facebook/flow