[yarn] Bump flow-typed to transitively bump shelljs

Summary:
There was a @dependabot PR that bumped shelljs from 0.84 -> 0.85: https://github.com/CommE2E/comm/pull/158 that failed for some reason.

Unfortunately the CI logs have long expired, but according to comment left by @ashoat the errors had something to do with flow.

I tried bumping shelljs this time by removing and re-adding the flow-typed dependency from each package.json and it seems to work fine?

Test Plan: CI

Reviewers: ashoat, palys-swm, benschac, def-au1t

Reviewed By: ashoat

Subscribers: Adrian, ashoat, yayabosh

Differential Revision: https://phabricator.ashoat.com/D4053