Update dependency eslint-plugin-flowtype to v5.9.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
eslint-plugin-flowtype	5.9.0 -> 5.9.1

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Release Notes

gajus/eslint-plugin-flowtype

### [`v5.9.1`](https://togithub.com/gajus/eslint-plugin-flowtype/releases/v5.9.1) [Compare Source](https://togithub.com/gajus/eslint-plugin-flowtype/compare/v5.9.0...v5.9.1) ##### Bug Fixes - support exact types in sort-keys ([#​494](https://togithub.com/gajus/eslint-plugin-flowtype/issues/494)) ([b038886](https://togithub.com/gajus/eslint-plugin-flowtype/commit/b038886b3bb5e3ea30acaadf3749a37fec7c7ad1))

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[elliotcourant]

bors r+

[bors[bot]]

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