support `eslint@8`

[ph-fritsche]

Most dependencies already updated to support eslint@8. Remaining are tracked here:

• jsx-a11y: [New] support ESLint 8.x jsx-eslint/eslint-plugin-jsx-a11y#810
• react: [New] support eslint 8.x jsx-eslint/eslint-plugin-react#3059
• react-hooks: feat(eslint-plugin-react-hooks): support ESLint 8.x facebook/react#22248 - merged but not released yet

[ph-fritsche]

Resolved in https://github.com/ph-fritsche/eslint-config/blob/97cfa58abdf3440b0fea3ba2cc0c61637876649f/package.json