Update rubyzip requirement from ~> 1.2.1 to >= 1.2.1, < 2.1.0 (#321)

Updates the requirements on [rubyzip](https://github.com/rubyzip/rubyzip) to permit the latest version.
- [Release notes](https://github.com/rubyzip/rubyzip/releases)
- [Changelog](https://github.com/rubyzip/rubyzip/blob/master/Changelog.md)
- [Commits](rubyzip/rubyzip@v1.2.2...v1.3.0)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -7,7 +7,7 @@ PATH
       faye-websocket (>= 0.10.7, < 0.12.0)
       listen (~> 2.10)
       rack-livereload
-      rubyzip (~> 1.2.1)
+      rubyzip (>= 1.2.1, < 2.4.0)
       sinatra (~> 1.4.6)
       sinatra-cross_origin (~> 0.3.1)
       thin (~> 1.8.0)
@@ -111,7 +111,7 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.9.0)
     rspec-support (3.9.2)
-    rubyzip (1.2.4)
+    rubyzip (1.3.0)
     safe_yaml (1.0.5)
     sass (3.7.4)
       sass-listen (~> 4.0.0)

zendesk_apps_tools.gemspec

@@ -16,7 +16,7 @@ Gem::Specification.new do |s|
   s.required_rubygems_version = '>= 1.3.6'
 
   s.add_runtime_dependency 'thor',        '~> 0.19.4'
-  s.add_runtime_dependency 'rubyzip',     '~> 1.2.1'
+  s.add_runtime_dependency 'rubyzip',     '>= 1.2.1', '< 2.4.0'
   s.add_runtime_dependency 'thin',        '~> 1.8.0'
   s.add_runtime_dependency 'sinatra',     '~> 1.4.6'
   s.add_runtime_dependency 'faraday',     '~> 0.9.2'