build(deps-dev): bump the gems group with 1 update

Bumps the gems group with 1 update: [rubocop](https://github.com/rubocop/rubocop).

- [Release notes](https://github.com/rubocop/rubocop/releases)
- [Changelog](https://github.com/rubocop/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v1.55.1...v1.56.0)

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

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

Gemfile

@@ -16,5 +16,5 @@ gem 'rake', '~> 13.0'
 group :test, :development do
   gem 'minitest', '~> 5.19'
   gem 'rack-test', '~> 2.1'
-  gem 'rubocop', '~> 1.55', require: false
+  gem 'rubocop', '~> 1.56', require: false
 end

Gemfile.lock

@@ -7,6 +7,7 @@ GEM
       minitest (>= 5.1)
       tzinfo (~> 2.0)
     ast (2.4.2)
+    base64 (0.1.1)
     builder (3.2.4)
     concurrent-ruby (1.2.2)
     dry-core (1.0.0)
@@ -65,7 +66,8 @@ GEM
     rake (13.0.6)
     regexp_parser (2.8.1)
     rexml (3.2.6)
-    rubocop (1.55.1)
+    rubocop (1.56.0)
+      base64 (~> 0.1.1)
       json (~> 2.3)
       language_server-protocol (>= 3.17.0)
       parallel (~> 1.10)
@@ -99,7 +101,7 @@ DEPENDENCIES
   rack-cors (~> 2.0)
   rack-test (~> 2.1)
   rake (~> 13.0)
-  rubocop (~> 1.55)
+  rubocop (~> 1.56)
 
 BUNDLED WITH
    2.4.1