Update hashie requirement from >= 2.0, < 5.0 to >= 2.0, < 6.0

Updates the requirements on [hashie](https://github.com/hashie/hashie) to permit the latest version.
- [Release notes](https://github.com/hashie/hashie/releases)
- [Changelog](https://github.com/hashie/hashie/blob/master/CHANGELOG.md)
- [Commits](hashie/hashie@v2.0.0...v5.0.0)

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

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

chef-zero.gemspec

@@ -14,7 +14,7 @@ Gem::Specification.new do |s|
   s.required_ruby_version = ">= 2.6"
 
   s.add_dependency "mixlib-log", ">= 2.0", "< 4.0"
-  s.add_dependency "hashie", ">= 2.0", "< 5.0"
+  s.add_dependency "hashie", ">= 2.0", "< 6.0"
   s.add_dependency "uuidtools", "~> 2.1"
   s.add_dependency "ffi-yajl", "~> 2.2"
   s.add_dependency "rack", "~> 2.0", ">= 2.0.6"