eslint 7 -> 8

[imsobear]

• eslint 8.0: https://eslint.org/blog/2021/06/whats-coming-in-eslint-8.0.0
• spec 需要支持下 8.0：使用@iceworks/spec，eslint升级到8.0之后，npm run eslint会报错 alibaba/ice#4741