Bump rubocop from 1.54.0 to 1.56.4

Bumps [rubocop](https://github.com/rubocop/rubocop) from 1.54.0 to 1.56.4.
- [Release notes](https://github.com/rubocop/rubocop/releases)
- [Changelog](https://github.com/rubocop/rubocop/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop/rubocop/compare/v1.54.0...v1.56.4)

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

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

Gemfile

@@ -6,7 +6,7 @@ gem 'minitest-ci', '~> 3.4'
 gem 'minitest-reporters', '~> 1.6'
 gem 'rake', '~> 13.0'
 gem 'rake-compiler', '~> 1.2'
-gem 'rubocop', '1.54.0'
+gem 'rubocop', '1.56.4'
 gem 'rubocop-minitest', '0.31.0'
 gem 'rubocop-packaging', '0.5.2'
 gem 'rubocop-performance', '1.18.0'

Gemfile.lock

@@ -8,6 +8,7 @@ GEM
   specs:
     ansi (1.5.0)
     ast (2.4.2)
+    base64 (0.1.1)
     builder (3.2.4)
     json (2.6.3)
     language_server-protocol (3.17.0.3)
@@ -29,8 +30,9 @@ GEM
     rake-compiler (1.2.5)
       rake
     regexp_parser (2.8.1)
-    rexml (3.2.5)
-    rubocop (1.54.0)
+    rexml (3.2.6)
+    rubocop (1.56.4)
+      base64 (~> 0.1.1)
       json (~> 2.3)
       language_server-protocol (>= 3.17.0)
       parallel (~> 1.10)
@@ -38,7 +40,7 @@ GEM
       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 (1.29.0)
@@ -66,7 +68,7 @@ DEPENDENCIES
   minitest-reporters (~> 1.6)
   rake (~> 13.0)
   rake-compiler (~> 1.2)
-  rubocop (= 1.54.0)
+  rubocop (= 1.56.4)
   rubocop-minitest (= 0.31.0)
   rubocop-packaging (= 0.5.2)
   rubocop-performance (= 1.18.0)