Update gc_ruboconfig requirement from ~> 4.3.0 to ~> 4.4.1 (#526)

Updates the requirements on [gc_ruboconfig](https://github.com/gocardless/ruboconfig) to permit the latest version.
- [Release notes](https://github.com/gocardless/ruboconfig/releases)
- [Changelog](https://github.com/gocardless/gc_ruboconfig/blob/master/CHANGELOG.md)
- [Commits](gocardless/gc_ruboconfig@v4.3.0...v4.4.1)

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

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

statesman.gemspec

@@ -24,7 +24,7 @@ Gem::Specification.new do |spec|
 
   spec.add_development_dependency "ammeter", "~> 1.1"
   spec.add_development_dependency "bundler", "~> 2"
-  spec.add_development_dependency "gc_ruboconfig", "~> 4.3.0"
+  spec.add_development_dependency "gc_ruboconfig", "~> 4.4.1"
   spec.add_development_dependency "mysql2", ">= 0.4", "< 0.6"
   spec.add_development_dependency "pg", ">= 0.18", "<= 1.6"
   spec.add_development_dependency "rails", ">= 5.2"