Update haml requirement from ~> 3.0 to >= 3, < 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@4.0.6...v5.0.0)

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

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

Author: dependabot[bot]

Gemfile.lock

@@ -60,7 +60,8 @@ GEM
       multi_json (>= 1.7.5, < 2.0)
       nokogiri (~> 1.6.3)
       oauth2
-    haml (4.0.6)
+    haml (5.0.0)
+      temple (>= 0.8.0)
       tilt
     hashie (3.3.2)
     highline (1.6.21)
@@ -135,6 +136,7 @@ GEM
       rack-protection (~> 1.4)
       tilt (~> 1.3, >= 1.3.4)
     slop (3.6.0)
+    temple (0.9.1)
     thread_safe (0.3.4)
     tilt (1.4.1)
     tzinfo (1.2.2)

mustachio.gemspec

@@ -75,7 +75,7 @@ Gem::Specification.new do |s|
       s.add_runtime_dependency(%q<magickly>, [">= 0"])
       s.add_runtime_dependency(%q<rest-client>, ["~> 1.6"])
       s.add_runtime_dependency(%q<addressable>, ["~> 2.2"])
-      s.add_runtime_dependency(%q<haml>, ["~> 3.0"])
+      s.add_runtime_dependency(%q<haml>, ">= 3", "< 7")
       s.add_runtime_dependency(%q<imagesize>, ["~> 0.1"])
       s.add_development_dependency(%q<jeweler>, ["~> 1.6"])
       s.add_development_dependency(%q<rack-test>, [">= 0"])
@@ -87,7 +87,7 @@ Gem::Specification.new do |s|
       s.add_dependency(%q<magickly>, [">= 0"])
       s.add_dependency(%q<rest-client>, ["~> 1.6"])
       s.add_dependency(%q<addressable>, ["~> 2.2"])
-      s.add_dependency(%q<haml>, ["~> 3.0"])
+      s.add_dependency(%q<haml>, ">= 3", "< 7")
       s.add_dependency(%q<imagesize>, ["~> 0.1"])
       s.add_dependency(%q<jeweler>, ["~> 1.6"])
       s.add_dependency(%q<rack-test>, [">= 0"])
@@ -100,7 +100,7 @@ Gem::Specification.new do |s|
     s.add_dependency(%q<magickly>, [">= 0"])
     s.add_dependency(%q<rest-client>, ["~> 1.6"])
     s.add_dependency(%q<addressable>, ["~> 2.2"])
-    s.add_dependency(%q<haml>, ["~> 3.0"])
+    s.add_dependency(%q<haml>, ">= 3", "< 7")
     s.add_dependency(%q<imagesize>, ["~> 0.1"])
     s.add_dependency(%q<jeweler>, ["~> 1.6"])
     s.add_dependency(%q<rack-test>, [">= 0"])