Update govuk_schemas requirement from ~> 4.4 to ~> 5.0

Updates the requirements on [govuk_schemas](https://github.com/alphagov/govuk_schemas_gem) to permit the latest version.
- [Changelog](https://github.com/alphagov/govuk_schemas/blob/main/CHANGELOG.md)
- [Commits](alphagov/govuk_schemas@v4.4.0...v5.0.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

gds-api-adapters.gemspec

@@ -24,7 +24,7 @@ Gem::Specification.new do |s|
 
   s.add_development_dependency "byebug"
   s.add_development_dependency "climate_control", "~> 1.2"
-  s.add_development_dependency "govuk_schemas", "~> 4.4"
+  s.add_development_dependency "govuk_schemas", "~> 5.0"
   s.add_development_dependency "minitest", "~> 5.19"
   s.add_development_dependency "minitest-around", "~> 0.5"
   s.add_development_dependency "mocha", "~> 2.1"