Bump eslint from 6.5.1 to 6.6.0 (#29592)

Bumps [eslint](https://github.com/eslint/eslint) from 6.5.1 to 6.6.0.
- [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/v6.5.1...v6.6.0)

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

package.json

@@ -98,7 +98,7 @@
     "clean-css-cli": "^4.3.0",
     "coveralls": "^3.0.7",
     "cross-env": "^6.0.3",
-    "eslint": "^6.5.1",
+    "eslint": "^6.6.0",
     "eslint-config-xo": "^0.27.2",
     "eslint-plugin-import": "^2.18.2",
     "eslint-plugin-unicorn": "^12.1.0",