Update pagy requirement from >= 6, < 8 to >= 6, < 9

Updates the requirements on [pagy](https://github.com/ddnexus/pagy) to permit the latest version.
- [Release notes](https://github.com/ddnexus/pagy/releases)
- [Changelog](https://github.com/ddnexus/pagy/blob/master/CHANGELOG.md)
- [Commits](ddnexus/pagy@6.0.0...8.3.0)

---
updated-dependencies:
- dependency-name: pagy
  dependency-type: direct:production
...

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

govuk-components.gemspec

@@ -23,7 +23,7 @@ Gem::Specification.new do |spec|
   spec.files = Dir["{app,config,lib}/**/*", "MIT-LICENSE", "Rakefile", "README.md"]
 
   spec.add_dependency("html-attributes-utils", "~> 1.0.0", ">= 1.0.0")
-  spec.add_dependency("pagy", ">= 6", "< 8")
+  spec.add_dependency("pagy", ">= 6", "< 9")
   spec.add_dependency("view_component", ">= 3.9", "< 3.12")
 
   spec.add_development_dependency "deep_merge"