Update rubocop to version 1.56.0

Gemfile.lock

@@ -73,6 +73,7 @@ GEM
     ast (2.4.2)
     autoprefixer-rails (10.4.13.0)
       execjs (~> 2)
+    base64 (0.1.1)
     bcrypt (3.1.19)
     bootstrap-sass (3.4.1)
       autoprefixer-rails (>= 5.2.1)
@@ -175,6 +176,7 @@ GEM
       activerecord
       kaminari-core (= 1.2.2)
     kaminari-core (1.2.2)
+    language_server-protocol (3.17.0.3)
     listen (3.8.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
@@ -282,7 +284,7 @@ GEM
     responders (3.1.0)
       actionpack (>= 5.2)
       railties (>= 5.2)
-    rexml (3.2.5)
+    rexml (3.2.6)
     riddle (2.4.3)
     rouge (4.1.2)
     rspec-core (3.12.2)
@@ -302,14 +304,16 @@ GEM
       rspec-mocks (~> 3.12)
       rspec-support (~> 3.12)
     rspec-support (3.12.1)
-    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 (1.29.0)