tools: update ESLint to 6.4.0

PR-URL: #29553
Refs: https://github.com/eslint/eslint/releases/tag/v6.4.0
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>
Reviewed-By: Jiawen Geng <[email protected]>
Reviewed-By: Minwoo Jung <[email protected]>

Author: zhangyongsheng