Build(deps): Bump rubocop-ast from 1.4.1 to 1.5.0 (PR #12924)

Bumps rubocop-ast from 1.4.1 to 1.5.0.


Sourced from rubocop-ast's changelog.

1.5.0 (2021-05-02)

New features

  • #182: Support Parser::Ruby31 for Ruby 3.1 parser (experimental). ([@​koic][])

1.4.2 (2021-05-02)

Bug fixes

  • #179: Have ast_with_comments distinguish nodes with same content. ([@​marcandre][])

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