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...v6.3.0)

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

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

oxidized-web.gemspec

@@ -18,7 +18,7 @@ Gem::Specification.new do |s|
 
   s.add_runtime_dependency 'charlock_holmes',     '~> 0.7.5'
   s.add_runtime_dependency 'emk-sinatra-url-for', '~> 0.2'
-  s.add_runtime_dependency 'haml',                '~> 5.0'
+  s.add_runtime_dependency 'haml',                '>= 5', '< 7'
   s.add_runtime_dependency 'htmlentities',        '~> 4.3'
   s.add_runtime_dependency 'oxidized',            '~> 0.26'
   s.add_runtime_dependency 'puma',                '~> 3.11.4'