ci: update github action Ruby stuff for 4.0

[mrhoribu]

Important

Update .rubocop.yml to target Ruby 4.0 and add Lint/MissingSuper rule.

• Configuration:
  • Update TargetRubyVersion to 4.0 in .rubocop.yml.
  • Add Lint/MissingSuper rule with AllowedParentClasses: [Object, BaseObject, GameBase::Game] in .rubocop.yml.

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[ellipsis-dev]

Important

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