Update rubocop requirement from ~> 1.50.2 to ~> 1.56.4

Updates the requirements on [rubocop](https://github.com/rubocop/rubocop) to permit the latest version.
- [Release notes](https://github.com/rubocop/rubocop/releases)
- [Changelog](https://github.com/rubocop/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v1.50.2...v1.56.4)

---
updated-dependencies:
- dependency-name: rubocop
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -8,14 +8,18 @@ GEM
   remote: https://rubygems.org/
   specs:
     ast (2.4.2)
+    base64 (0.1.1)
     diff-lcs (1.5.0)
     json (2.6.3)
-    parallel (1.22.1)
-    parser (3.2.2.0)
+    language_server-protocol (3.17.0.3)
+    parallel (1.23.0)
+    parser (3.2.2.3)
       ast (~> 2.4.1)
+      racc
+    racc (1.7.1)
     rainbow (3.1.1)
-    regexp_parser (2.7.0)
-    rexml (3.2.5)
+    regexp_parser (2.8.1)
+    rexml (3.2.6)
     rspec (3.12.0)
       rspec-core (~> 3.12.0)
       rspec-expectations (~> 3.12.0)
@@ -29,28 +33,30 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.12.0)
     rspec-support (3.12.0)
-    rubocop (1.50.2)
+    rubocop (1.56.4)
+      base64 (~> 0.1.1)
       json (~> 2.3)
+      language_server-protocol (>= 3.17.0)
       parallel (~> 1.10)
-      parser (>= 3.2.0.0)
+      parser (>= 3.2.2.3)
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 1.8, < 3.0)
       rexml (>= 3.2.5, < 4.0)
-      rubocop-ast (>= 1.28.0, < 2.0)
+      rubocop-ast (>= 1.28.1, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 2.4.0, < 3.0)
-    rubocop-ast (1.28.0)
+    rubocop-ast (1.29.0)
       parser (>= 3.2.1.0)
     ruby-progressbar (1.13.0)
-    unicode-display_width (2.4.2)
+    unicode-display_width (2.5.0)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
   rspec (~> 3.0)
   rspec-github!
-  rubocop (~> 1.50.2)
+  rubocop (~> 1.56.4)
 
 BUNDLED WITH
    2.2.19

rspec-github.gemspec

@@ -23,5 +23,5 @@ Gem::Specification.new do |spec|
 
   spec.add_runtime_dependency 'rspec-core', '~> 3.0'
   spec.add_development_dependency 'rspec', '~> 3.0'
-  spec.add_development_dependency 'rubocop', '~> 1.50.2'
+  spec.add_development_dependency 'rubocop', '~> 1.56.4'
 end