build(deps): bump rubocop-ast from 1.14.0 to 1.15.0

[dependabot[bot]]

Bumps rubocop-ast from 1.14.0 to 1.15.0.

Changelog

Sourced from rubocop-ast's changelog.

1.15.0 (2021-12-12)

New features

• #10219: Add value_omission method to AST::PairNode for Ruby 3.1's hash value omission. ([@​koic][])

Commits

• 419116f Cut 1.15.0
• cab37e6 Update Changelog
• a18b064 Add value_omission method to AST::PairNode
• 85e01c2 Restore docs/antora.yml
• See full diff in compare view

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