rubocop-ast: format and fix type signatures to pass rbs/test @kozy4324

[kozy4324]

cd gems/rubocop-ast/1.30/_test/
RBS_TEST_TARGET='RuboCop::AST::*' ruby -r rbs/test/setup test.rb

cd gems/rubocop-ast/1.46/_test/
RBS_TEST_TARGET='RuboCop::AST::*' ruby -r rbs/test/setup test.rb

[github-actions]

@kozy4324 Thanks for your contribution!

Please follow the instructions below for each change.
See also: https://github.com/ruby/gem_rbs_collection/blob/main/docs/CONTRIBUTING.md

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rubocop-ast

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[kozy4324]

/merge