9.0.0

• Migrated to ESLint 8
• Enabled new rules:
  • base config:
    • prefer-promise-reject-errors
    • require-atomic-updates
  • react-testing config:
    • testing-library/no-global-regexp-flag-in-query
    • testing-library/no-wait-for-multiple-assertions
    • testing-library/prefer-query-by-disappearance
  • common-plugins config:
    • jest/no-conditional-in-test
    • jest/no-deprecated-functions
    • jest/prefer-comparison-matcher
    • jest/prefer-equality-matcher
    • jest/prefer-expect-resolves
    • jest/prefer-hooks-in-order
    • jest/prefer-mock-promise-shorthand
    • jest/prefer-to-be
    • jest/valid-describe-callback
    • jest/valid-expect
    • jest/valid-title
    • unicorn/no-await-expression-member
    • unicorn/no-invalid-remove-event-listener
    • unicorn/no-useless-fallback-in-spread
    • unicorn/no-useless-length-check
    • unicorn/no-useless-promise-resolve-reject
    • unicorn/no-useless-spread
    • unicorn/prefer-at
    • unicorn/prefer-export-from
    • unicorn/prefer-native-coercion-functions
    • unicorn/prefer-native-coercion-functions
    • unicorn/prefer-top-level-await