build(deps-dev): Bump eslint-plugin-flowtype from 4.7.0 to 5.4.0 (#127)

Bumps [eslint-plugin-flowtype](https://github.com/gajus/eslint-plugin-flowtype) from 4.7.0 to 5.4.0.
- [Release notes](https://github.com/gajus/eslint-plugin-flowtype/releases)
- [Commits](gajus/eslint-plugin-flowtype@v4.7.0...v5.4.0)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -85,7 +85,7 @@
     "eslint": "^7.21.0",
     "eslint-config-prettier": "^6.15.0",
     "eslint-config-react-app": "^5.2.1",
-    "eslint-plugin-flowtype": "^4.7.0",
+    "eslint-plugin-flowtype": "^5.4.0",
     "eslint-plugin-header": "^3.0.0",
     "eslint-plugin-import": "^2.22.0",
     "eslint-plugin-jsx-a11y": "^6.3.1",