Remove management of rack gem

This code doesn't do anything.
rack is a dependency of sinatra which the module is already installing.

.fixtures.yml

@@ -1,17 +1,17 @@
 fixtures:
   repositories:
     stdlib:
-      repo: "git://github.com/puppetlabs/puppetlabs-stdlib.git"
+      repo: "https://github.com/puppetlabs/puppetlabs-stdlib.git"
       ref:  "4.15.0"
-    ruby:    "git://github.com/puppetlabs/puppetlabs-ruby.git"
-    gcc:     "git://github.com/puppetlabs/puppetlabs-gcc.git"
-    pe_gem:  "git://github.com/puppetlabs/puppetlabs-pe_gem.git"
-    make:    "git://github.com/voxpupuli/puppet-make.git"
-    inifile: "git://github.com/puppetlabs/puppetlabs-inifile.git"
-    vcsrepo: "git://github.com/puppetlabs/puppetlabs-vcsrepo.git"
-    git:     "git://github.com/puppetlabs/puppetlabs-git.git"
+    ruby:    "https://github.com/puppetlabs/puppetlabs-ruby.git"
+    gcc:     "https://github.com/puppetlabs/puppetlabs-gcc.git"
+    pe_gem:  "https://github.com/puppetlabs/puppetlabs-pe_gem.git"
+    make:    "https://github.com/voxpupuli/puppet-make.git"
+    inifile: "https://github.com/puppetlabs/puppetlabs-inifile.git"
+    vcsrepo: "https://github.com/puppetlabs/puppetlabs-vcsrepo.git"
+    git:     "https://github.com/puppetlabs/puppetlabs-git.git"
     portage:
-      repo: "git://github.com/gentoo/puppet-portage.git"
+      repo: "https://github.com/gentoo/puppet-portage.git"
       ref: "2.3.0"
   symlinks:
     r10k:    "#{source_dir}"

manifests/webhook/package.pp

@@ -11,13 +11,6 @@
       before   => Service['webhook'],
     }
   }
-  if !defined(Package['rack']) {
-    package { 'rack':
-      ensure   => installed,
-      provider => $provider,
-      before   => Service['webhook'],
-    }
-  }
   if (! $is_pe_server) {
     if !defined(Package['webrick']) {
       package { 'webrick':

spec/classes/webhook/package_spec.rb

@@ -24,7 +24,6 @@
             provider: 'puppet_gem'
           )
         end
-        it { is_expected.to contain_package('rack').with(ensure: 'installed') }
         it { is_expected.not_to contain_package('webrick') }
         it { is_expected.not_to contain_package('json') }
       end
@@ -40,7 +39,6 @@
         it { is_expected.to contain_package('sinatra').with(ensure: 'installed') }
         it { is_expected.to contain_package('webrick').with(ensure: 'installed') }
         it { is_expected.to contain_package('json').with(ensure: 'installed') }
-        it { is_expected.to contain_package('rack').with(ensure: 'installed') }
       end
     end
   end