[Fix] pin `eslint` to < `v8.9`, since it breaks ES3 strict mode parsing
[Fix] pin `eslint` to < `v8.9`, since it breaks ES3 strict mode parsing

See https://github.com/eslint/eslint/pull/15595 / https://github.com/eslint/eslint-scope/pull/87 / https://github.com/eslint/eslint-scope/issues/86 / https://github.com/eslint/eslint/issues/15456

ljharb/eslint-config