Update dependency eslint-plugin-flowtype to v4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
eslint-plugin-flowtype	devDependencies	major	^3.0.0 -> ^4.0.0

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Release Notes

gajus/eslint-plugin-flowtype

### [`v4.5.2`](https://togithub.com/gajus/eslint-plugin-flowtype/releases/v4.5.2) [Compare Source](https://togithub.com/gajus/eslint-plugin-flowtype/compare/v4.5.1...v4.5.2) ##### Bug Fixes - enforce editorconfig (fixes [#​438](https://togithub.com/gajus/eslint-plugin-flowtype/issues/438)) ([70b4fee](https://togithub.com/gajus/eslint-plugin-flowtype/commit/70b4feefa524bce09ab5d8e629595a4b7bdd2ea8)) ### [`v4.5.1`](https://togithub.com/gajus/eslint-plugin-flowtype/releases/v4.5.1) [Compare Source](https://togithub.com/gajus/eslint-plugin-flowtype/compare/v4.5.0...v4.5.1) ##### Bug Fixes - make the build work in Windows (fixes [#​438](https://togithub.com/gajus/eslint-plugin-flowtype/issues/438)) ([d761d3c](https://togithub.com/gajus/eslint-plugin-flowtype/commit/d761d3c099c5dd94b91f91d2eb3cc7f9d8349ea0)) ### [`v4.5.0`](https://togithub.com/gajus/eslint-plugin-flowtype/releases/v4.5.0) [Compare Source](https://togithub.com/gajus/eslint-plugin-flowtype/compare/v4.4.1...v4.5.0) ##### Features - support inexact object notation in delimiter-dangle rule ([#​437](https://togithub.com/gajus/eslint-plugin-flowtype/issues/437)) ([3258d30](https://togithub.com/gajus/eslint-plugin-flowtype/commit/3258d302b9bfa47df1a9919f5c853c0ca7354044)) ### [`v4.4.1`](https://togithub.com/gajus/eslint-plugin-flowtype/releases/v4.4.1) [Compare Source](https://togithub.com/gajus/eslint-plugin-flowtype/compare/v4.4.0...v4.4.1) ##### Bug Fixes - handle the case where superTypeParameters is undefined ([9b046e4](https://togithub.com/gajus/eslint-plugin-flowtype/commit/9b046e4c80229f65aa9affa2a8b25ce11d44dc34)) ### [`v4.4.0`](https://togithub.com/gajus/eslint-plugin-flowtype/releases/v4.4.0) [Compare Source](https://togithub.com/gajus/eslint-plugin-flowtype/compare/v4.3.1...v4.4.0) ##### Features - require-return-type always-enforce ([#​436](https://togithub.com/gajus/eslint-plugin-flowtype/issues/436)) ([45ee910](https://togithub.com/gajus/eslint-plugin-flowtype/commit/45ee910ea27d3b4d96b45920f0a55cd6b74f4536)) ### [`v4.3.1`](https://togithub.com/gajus/eslint-plugin-flowtype/releases/v4.3.1) [Compare Source](https://togithub.com/gajus/eslint-plugin-flowtype/compare/v4.3.0...v4.3.1) ##### Bug Fixes - no-dedupe with setters or getters ([#​435](https://togithub.com/gajus/eslint-plugin-flowtype/issues/435)) ([da05064](https://togithub.com/gajus/eslint-plugin-flowtype/commit/da05064f1ced96d152868a6952304c0dcf496239)) ### [`v4.3.0`](https://togithub.com/gajus/eslint-plugin-flowtype/releases/v4.3.0) [Compare Source](https://togithub.com/gajus/eslint-plugin-flowtype/compare/v4.2.0...v4.3.0) ##### Features - do not raise generic spacing on line break ([#​430](https://togithub.com/gajus/eslint-plugin-flowtype/issues/430)) ([63815f9](https://togithub.com/gajus/eslint-plugin-flowtype/commit/63815f9)) ### [`v4.2.0`](https://togithub.com/gajus/eslint-plugin-flowtype/releases/v4.2.0) [Compare Source](https://togithub.com/gajus/eslint-plugin-flowtype/compare/v4.1.0...v4.2.0) ##### Features - add --fix support to require-indexer-name ([#​426](https://togithub.com/gajus/eslint-plugin-flowtype/issues/426)) ([72a8a55](https://togithub.com/gajus/eslint-plugin-flowtype/commit/72a8a55)) ### [`v4.1.0`](https://togithub.com/gajus/eslint-plugin-flowtype/releases/v4.1.0) [Compare Source](https://togithub.com/gajus/eslint-plugin-flowtype/compare/v4.0.0...v4.1.0) ##### Features - add require-indexer-name rule ([#​425](https://togithub.com/gajus/eslint-plugin-flowtype/issues/425)) ([83b48d5](https://togithub.com/gajus/eslint-plugin-flowtype/commit/83b48d5)) ### [`v4.0.0`](https://togithub.com/gajus/eslint-plugin-flowtype/releases/v4.0.0) [Compare Source](https://togithub.com/gajus/eslint-plugin-flowtype/compare/v3.13.0...v4.0.0) ##### Bug Fixes - update dependencies ([#​424](https://togithub.com/gajus/eslint-plugin-flowtype/issues/424)) ([091fbf3](https://togithub.com/gajus/eslint-plugin-flowtype/commit/091fbf3)) ##### BREAKING CHANGES - Bump ESLint to v6

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