Bump rubocop from 1.51.0 to 1.56.0

Bumps [rubocop](https://github.com/rubocop/rubocop) from 1.51.0 to 1.56.0.
- [Release notes](https://github.com/rubocop/rubocop/releases)
- [Changelog](https://github.com/rubocop/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v1.51.0...v1.56.0)

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

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

Gemfile.lock

@@ -53,6 +53,7 @@ GEM
     ast (2.4.2)
     autoprefixer-rails (10.4.7.0)
       execjs (~> 2)
+    base64 (0.1.1)
     bindex (0.8.1)
     bootstrap-sass (3.4.1)
       autoprefixer-rails (>= 5.2.1)
@@ -189,6 +190,7 @@ GEM
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
     json (2.6.3)
+    language_server-protocol (3.17.0.3)
     libv8 (3.16.14.19)
     loofah (2.19.1)
       crass (~> 1.0.2)
@@ -214,8 +216,9 @@ GEM
       racc (~> 1.4)
     okcomputer (1.18.4)
     parallel (1.23.0)
-    parser (3.2.2.1)
+    parser (3.2.2.3)
       ast (~> 2.4.1)
+      racc
     psych (4.0.4)
       stringio
     public_suffix (5.0.1)
@@ -259,8 +262,8 @@ GEM
     rdoc (6.4.0)
       psych (>= 4.0.0)
     ref (2.0.0)
-    regexp_parser (2.8.0)
-    rexml (3.2.5)
+    regexp_parser (2.8.1)
+    rexml (3.2.6)
     rspec-core (3.11.0)
       rspec-support (~> 3.11.0)
     rspec-expectations (3.11.0)
@@ -278,17 +281,19 @@ GEM
       rspec-mocks (~> 3.10)
       rspec-support (~> 3.10)
     rspec-support (3.11.0)
-    rubocop (1.51.0)
+    rubocop (1.56.0)
+      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 (1.28.1)
+    rubocop-ast (1.29.0)
       parser (>= 3.2.1.0)
     rubocop-capybara (2.18.0)
       rubocop (~> 1.41)