chore(deps): update haml requirement from ~> 5.0 to >= 5, < 7

Updates the requirements on [haml](https://github.com/haml/haml) to permit the latest version.
- [Release notes](https://github.com/haml/haml/releases)
- [Changelog](https://github.com/haml/haml/blob/main/CHANGELOG.md)
- [Commits](haml/haml@v5.0.0...v6.0.0)

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

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

nova_git_stats.gemspec

@@ -28,7 +28,7 @@ Gem::Specification.new do |s|
 
   s.add_dependency('actionview', '>= 5.2', '< 8.0')
   s.add_dependency('activesupport', '>= 5.2', '< 8.0')
-  s.add_dependency('haml', '~> 5.0')
+  s.add_dependency('haml', '>= 5', '< 7')
   s.add_dependency('i18n', '~> 1.8')
   s.add_dependency('lazy_high_charts', '~> 1.6')
   s.add_dependency('thor', '~> 1.0')