Bump rubocop from 1.39.0 to 1.56.4

Bumps [rubocop](https://github.com/rubocop/rubocop) from 1.39.0 to 1.56.4.
- [Release notes](https://github.com/rubocop/rubocop/releases)
- [Changelog](https://github.com/rubocop/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v1.39.0...v1.56.4)

---
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

@@ -8,6 +8,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     ast (2.4.2)
+    base64 (0.1.1)
     childprocess (4.1.0)
     concurrent-ruby (1.2.2)
     diff-lcs (1.5.0)
@@ -21,6 +22,7 @@ GEM
       concurrent-ruby (~> 1.0)
     iniparse (1.5.0)
     json (2.6.3)
+    language_server-protocol (3.17.0.3)
     mini_mime (1.1.5)
     multi_xml (0.6.0)
     overcommit (0.60.0)
@@ -51,16 +53,18 @@ GEM
     rspec-retry (0.6.2)
       rspec-core (> 3.3)
     rspec-support (3.12.1)
-    rubocop (1.39.0)
+    rubocop (1.56.4)
+      base64 (~> 0.1.1)
       json (~> 2.3)
+      language_server-protocol (>= 3.17.0)
       parallel (~> 1.10)
-      parser (>= 3.1.2.1)
+      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 (>= 1.23.0, < 2.0)
+      rubocop-ast (>= 1.28.1, < 2.0)
       ruby-progressbar (~> 1.7)
-      unicode-display_width (>= 1.4.0, < 3.0)
+      unicode-display_width (>= 2.4.0, < 3.0)
     rubocop-ast (1.29.0)
       parser (>= 3.2.1.0)
     rubocop-performance (1.19.1)