fix: Gemfile & Gemfile.lock to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-RUBY-REXML-8309365

Gemfile

@@ -25,7 +25,7 @@ group :development, :test do
   gem 'byebug', platform: :mri # Call 'byebug' anywhere in the code to stop execution and get a debugger console
   gem 'rb-readline'
   gem 'rspec-rails', '~> 3.5'
-  gem 'rubocop', '~> 1.19.0' # Enforce ruby code style
+  gem 'rubocop', '~> 1.66.0' # Enforce ruby code style
   gem 'rubocop-rails', '~> 2.12'
   gem 'rubocop-rspec', '~> 2.5'
   gem 'simplecov', require: false # determine code coverage of tests

Gemfile.lock

@@ -77,6 +77,8 @@ GEM
     jbuilder (2.11.5)
       actionview (>= 5.0.0)
       activesupport (>= 5.0.0)
+    json (2.7.5)
+    language_server-protocol (3.17.0.3)
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
@@ -112,15 +114,15 @@ GEM
     nokogiri (1.12.5)
       mini_portile2 (~> 2.6.1)
       racc (~> 1.4)
-    parallel (1.23.0)
-    parser (3.2.2.3)
+    parallel (1.26.3)
+    parser (3.3.5.1)
       ast (~> 2.4.1)
       racc
     pg (0.21.0)
     public_suffix (4.0.7)
     puma (4.3.12)
       nio4r (~> 2.0)
-    racc (1.7.1)
+    racc (1.8.1)
     rack (2.2.7)
     rack-test (2.1.0)
       rack (>= 1.3)
@@ -154,10 +156,10 @@ GEM
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     rb-readline (0.5.5)
-    regexp_parser (2.8.1)
+    regexp_parser (2.9.2)
     request_store (1.5.1)
       rack (>= 1.4)
-    rexml (3.2.5)
+    rexml (3.3.9)
     rspec-core (3.9.3)
       rspec-support (~> 3.9.3)
     rspec-expectations (3.9.4)
@@ -175,17 +177,18 @@ GEM
       rspec-mocks (~> 3.9.0)
       rspec-support (~> 3.9.0)
     rspec-support (3.9.4)
-    rubocop (1.19.1)
+    rubocop (1.66.1)
+      json (~> 2.3)
+      language_server-protocol (>= 3.17.0)
       parallel (~> 1.10)
-      parser (>= 3.0.0.0)
+      parser (>= 3.3.0.2)
       rainbow (>= 2.2.2, < 4.0)
-      regexp_parser (>= 1.8, < 3.0)
-      rexml
-      rubocop-ast (>= 1.9.1, < 2.0)
+      regexp_parser (>= 2.4, < 3.0)
+      rubocop-ast (>= 1.32.2, < 2.0)
       ruby-progressbar (~> 1.7)
-      unicode-display_width (>= 1.4.0, < 3.0)
-    rubocop-ast (1.17.0)
-      parser (>= 3.1.1.0)
+      unicode-display_width (>= 2.4.0, < 3.0)
+    rubocop-ast (1.33.0)
+      parser (>= 3.3.1.0)
     rubocop-rails (2.14.2)
       activesupport (>= 4.2.0)
       rack (>= 1.1)
@@ -222,7 +225,7 @@ GEM
     timeout (0.3.2)
     tzinfo (1.2.11)
       thread_safe (~> 0.1)
-    unicode-display_width (2.4.2)
+    unicode-display_width (2.6.0)
     webmock (3.18.1)
       addressable (>= 2.8.0)
       crack (>= 0.3.2)
@@ -248,7 +251,7 @@ DEPENDENCIES
   rails (~> 5.2)
   rb-readline
   rspec-rails (~> 3.5)
-  rubocop (~> 1.19.0)
+  rubocop (~> 1.66.0)
   rubocop-rails (~> 2.12)
   rubocop-rspec (~> 2.5)
   simplecov
@@ -257,3 +260,5 @@ DEPENDENCIES
   strong_migrations (~> 0.3)
   webmock
 
+BUNDLED WITH
+   2.1.4