Update irb requirement from ~> 1.13.1 to ~> 1.13.2 (#244)

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@v1.13.1...v1.13.2)

---
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

@@ -7,7 +7,7 @@ gemspec
 
 group :development, :test do
   gem 'rake', '~> 13.2.1'
-  gem 'irb', '~> 1.13.1'
+  gem 'irb', '~> 1.13.2'
   gem 'irb-power_assert', '0.3.1'
 end