Bump rubocop from 0.79.0 to 0.81.0

Bumps [rubocop](https://github.com/rubocop-hq/rubocop) from 0.79.0 to 0.81.0.
- [Release notes](https://github.com/rubocop-hq/rubocop/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop-hq/rubocop/compare/v0.79.0...v0.81.0)

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

Gemfile

@@ -24,7 +24,7 @@ group :development, :unit_tests do
   gem 'metadata-json-lint',                               '~> 2.3'
   gem 'puppetlabs_spec_helper',                           '~> 2.3'
   gem 'rspec-puppet',                                     '~> 2.6'
-  gem 'rubocop',                                          '~> 0.79'
+  gem 'rubocop',                                          '~> 0.81'
   gem 'tty-command',                                      '~> 0.6'
   gem 'tty-file',                                         '~> 0.4'
   gem 'tty-prompt',                                       '~> 0.21'

Gemfile.lock

@@ -41,7 +41,7 @@ GEM
     necromancer (0.5.1)
     os (1.1.0)
     parallel (1.19.1)
-    parser (2.7.0.1)
+    parser (2.7.1.0)
       ast (~> 2.4.0)
     pastel (0.7.3)
       equatable (~> 0.6)
@@ -107,6 +107,7 @@ GEM
       puppet_forge (~> 2.3.0)
     rainbow (3.0.0)
     rake (13.0.1)
+    rexml (3.2.4)
     rspec (3.9.0)
       rspec-core (~> 3.9.0)
       rspec-expectations (~> 3.9.0)
@@ -122,13 +123,14 @@ GEM
     rspec-puppet (2.7.8)
       rspec
     rspec-support (3.9.0)
-    rubocop (0.79.0)
+    rubocop (0.81.0)
       jaro_winkler (~> 1.5.1)
       parallel (~> 1.10)
       parser (>= 2.7.0.1)
       rainbow (>= 2.2.2, < 4.0)
+      rexml
       ruby-progressbar (~> 1.7)
-      unicode-display_width (>= 1.4.0, < 1.7)
+      unicode-display_width (>= 1.4.0, < 2.0)
     ruby-progressbar (1.10.1)
     rugged (1.0.0)
     semantic_puppet (1.0.2)
@@ -152,7 +154,7 @@ GEM
       tty-screen (~> 0.7)
       wisper (~> 2.0.0)
     tty-screen (0.7.1)
-    unicode-display_width (1.6.0)
+    unicode-display_width (1.7.0)
     wisper (2.0.1)
     xmlrpc (0.3.0)
     yamllint (0.0.9)
@@ -182,7 +184,7 @@ DEPENDENCIES
   puppetlabs_spec_helper (~> 2.3)
   r10k (~> 3.4)
   rspec-puppet (~> 2.6)
-  rubocop (~> 0.79)
+  rubocop (~> 0.81)
   rugged (~> 1.0)
   tty-command (~> 0.6)
   tty-file (~> 0.4)