Bump eslint from 6.1.0 to 6.4.0 (#11929)

Bumps [eslint](https://github.com/eslint/eslint) from 6.1.0 to 6.4.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/eslint/eslint/compare/v6.1.0...v6.4.0)

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

package.json

@@ -174,7 +174,7 @@
     "babel-jest": "^24.9.0",
     "enzyme": "^3.10.0",
     "enzyme-adapter-react-16": "^1.14.0",
-    "eslint": "^6.1.0",
+    "eslint": "^6.4.0",
     "eslint-plugin-import": "~2.18.2",
     "eslint-plugin-jsx-a11y": "~6.2.3",
     "eslint-plugin-promise": "~4.2.1",