chore(deps-dev): bump irb from 1.9.0 to 1.9.1

[dependabot[bot]]

Bumps irb from 1.9.0 to 1.9.1.

Release notes

Sourced from irb's releases.

v1.9.1

What's Changed

✨ Enhancements

• Enable completion setting through IRB_COMPLETOR by @​ima1zumi in ruby/irb#771

🐛 Bug Fixes

• Fix irb-1.9.0 crash on {}. completion by @​tompng in ruby/irb#764

🛠 Other Changes

• Remove racc from Gemfile by @​st0012 in ruby/irb#760
• require 'irb/version to test completion of constant IRB::VERSION by @​tompng in ruby/irb#763
• Bump version to 1.9.1 by @​tompng in ruby/irb#773

Full Changelog: https://github.com/ruby/irb/compare/v1.9.0...v1.9.1

Commits

• 997df3e Bump version to 1.9.1 (#773)
• 032f6da Enable Setting Completer Type through IRB_COMPLETOR (#771)
• 07e4d54 Fix irb crash on {}. completion (#764)
• d3b7940 require irb/version to test IRB::VERSION (#763)
• afbba64 Remove racc from Gemfile (#760)
• See full diff in compare view

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