Update irb requirement from ~> 1.13.2 to ~> 1.14.0 (#570)

Updates the requirements on [irb](https://github.com/ruby/irb) to permit the latest version.
- [Release notes](https://github.com/ruby/irb/releases)
- [Commits](ruby/irb@v1.13.2...v1.14.0)

---
updated-dependencies:
- dependency-name: irb
  dependency-type: direct:development
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile

@@ -6,7 +6,7 @@ gemspec
 
 group(:development, :test) do
   gem('rake', '~> 13.2.1')
-  gem('irb', '~> 1.13.2')
+  gem('irb', '~> 1.14.0')
   gem('irb-power_assert', '0.3.1')
   gem('perfect_toml', '~> 0.9.0', require: false)
 end