AVRO-3553: Limit changes to rubocop lint

[RyanSkraba]

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[RyanSkraba]

I'm going to merge this as-is to unblock the build!

[tjwp]

Sorry I didn't see this earlier. I think this other fix would have been to remove these lines from .rubocop.yml: https://github.com/apache/avro/blob/master/lang/ruby/.rubocop.yml#L54-L55

I can file an issue to remove the version restriction on the main branch. This is okay for the 1.11.1 release as it affects development.

[RyanSkraba]

Thanks @tjwp! Is there any value to adding the Gemspec/DeprecatedAttributeAssignment rule?

I'm still going to have to learn a bit more ruby one day :D