Update dependency installation versions

[dru89]

This updates the dependency installation versions to match the versions for the peer dependencies in the package.json.

Specifically:

• @typescript-eslint dependencies are now 3.x (up from 2.x)
• eslint is now 7.x (previously 6.x)
• eslint-plugin-flowtype is not 5.x (previously 4.x)
• and eslint-plugin-react-hooks is now at 4.x (up from 2.x)

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[dru89]

Hmm, I'm realizing that package.json says 5.2.1 (released in March), but the actual packages in there are for the "latest" version of eslint-config-react-app which hasn't yet been released.

Perhaps we shouldn't update the README.md with these versions until we actually do a release with the latest changes.

[mrmckeb]

Sorry, I commented on the wrong PR.

This is covered by #9434 already, so I've closed this one off @dru89 - thanks for your time though.

[dru89]

Ha, no problem! Thanks for the response and letting me know. 😄