Update git requirement from ~> 1.7 to >= 1.7, < 3.0

Updates the requirements on [git](https://github.com/ruby-git/ruby-git) to permit the latest version.
- [Release notes](https://github.com/ruby-git/ruby-git/releases)
- [Changelog](https://github.com/ruby-git/ruby-git/blob/master/CHANGELOG.md)
- [Commits](ruby-git/ruby-git@v1.7.0...v2.0.0)

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

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

modulesync.gemspec

@@ -23,7 +23,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'simplecov'
   spec.add_development_dependency 'voxpupuli-rubocop', '~> 2.7.0'
 
-  spec.add_runtime_dependency 'git', '~>1.7'
+  spec.add_runtime_dependency 'git', '>=1.7', '<3.0'
   spec.add_runtime_dependency 'gitlab', '~>4.0'
   spec.add_runtime_dependency 'octokit', '>=4', '<9'
   spec.add_runtime_dependency 'puppet-blacksmith', '>= 3.0', '< 8'