Bump Rubocop to 1.56.4 (#9459)

Merge pull request 9459

Gemfile

@@ -24,7 +24,7 @@ group :test do
   gem "nokogiri", "~> 1.7"
   gem "rspec"
   gem "rspec-mocks"
-  gem "rubocop", "~> 1.54.0"
+  gem "rubocop", "~> 1.56.4"
   gem "rubocop-minitest"
   gem "rubocop-performance"
   gem "rubocop-rake"

lib/jekyll/drops/drop.rb

@@ -280,7 +280,8 @@ module Jekyll
         return self[key] if key?(key)
         raise KeyError, %(key not found: "#{key}") if default.nil? && block.nil?
         return yield(key) unless block.nil?
-        return default unless default.nil?
+
+        default unless default.nil?
       end
 
       private