Update octokit requirement from >= 4, < 8 to >= 4, < 9

Updates the requirements on [octokit](https://github.com/octokit/octokit.rb) to permit the latest version.
- [Release notes](https://github.com/octokit/octokit.rb/releases)
- [Changelog](https://github.com/octokit/octokit.rb/blob/main/RELEASE.md)
- [Commits](octokit/octokit.rb@v4.0.0...v4.25.1)

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

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

modulesync.gemspec

@@ -25,7 +25,7 @@ Gem::Specification.new do |spec|
 
   spec.add_runtime_dependency 'git', '~>1.7'
   spec.add_runtime_dependency 'gitlab', '~>4.0'
-  spec.add_runtime_dependency 'octokit', '>=4', '<8'
+  spec.add_runtime_dependency 'octokit', '>=4', '<9'
   spec.add_runtime_dependency 'puppet-blacksmith', '>= 3.0', '< 8'
   spec.add_runtime_dependency 'thor'
 end