chore(deps): update flow-bin to v0.121.0

[thi-bot]

This PR contains the following updates:

Package	Update	Type	Change	Sourcegraph
flow-bin (changelog)	minor	devDependencies	0.120.1 -> 0.121.0

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Release Notes

flowtype/flow-bin

### [`v0.121.0`](https://togithub.com/flowtype/flow-bin/compare/v0.120.1...v0.121.0) [Compare Source](https://togithub.com/flowtype/flow-bin/compare/v0.120.1...v0.121.0)

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