ruby: fix failing tests with Ruby 3.0

[stanhu]

The tests were previously failing due to keyword argument changes in Ruby 3.0.

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• [ ] If a ticket exists: Does your pull request title follow the pattern "THRIFT-NNNN: describe my issue"?
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[Jens-G]

Thanks!

There are some more errors, possible to fix these as well?

Primarily this one:

TypeError: can't convert SpecServerSocket to IO (SpecServerSocket#to_io gives NilClass)

but there's also some more warnings.

[stanhu]

Thanks!

There are some more errors, possible to fix these as well?

Primarily this one:

TypeError: can't convert SpecServerSocket to IO (SpecServerSocket#to_io gives NilClass)

but there's also some more warnings.

I think that warning is from Ruby 2.5. I'm not seeing this test failure in Ruby 2.7.5 or 3.0.5.