Update gc_ruboconfig requirement from ~> 2.33.0 to ~> 3.0.0

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@v2.33.0...v3.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Gemfile

@@ -6,7 +6,7 @@ source "https://rubygems.org"
 gemspec
 
 group :development, :test do
-  gem "gc_ruboconfig", "~> 2.33.0"
+  gem "gc_ruboconfig", "~> 3.0.0"
   gem "pry", "~> 0.14.1"
   gem "rake", "~> 13.0"
   gem "rspec", "~> 3.11.0"