Update Prettier
Summary:
Our current version of Prettier was printing an error when parsing import.meta.url. Upgrading it resolving the problem.
This diff was generated by updating the version of Prettier in package.json, running yarn cleaninstall, and then running prettier --write . from the root of the repo. After that, I just had a couple of places I need to manually fix up.
Test Plan: Flow + ESLint
Reviewers: tomek, atul, jon
Reviewed By: atul
Differential Revision: https://phab.comm.dev/D6783