Bump RuboCop to v0.68.x (#7637)

Merge pull request 7637

.rubocop.yml

@@ -1,6 +1,7 @@
 ---
 
 require:
+  - rubocop-performance
   - ./rubocop/jekyll
 
 Jekyll/NoPutsAllowed:
@@ -23,9 +24,9 @@ Layout/AlignHash:
   EnforcedHashRocketStyle: table
 Layout/IndentationWidth:
   Severity: error
-Layout/IndentArray:
+Layout/IndentFirstArrayElement:
   EnforcedStyle: consistent
-Layout/IndentHash:
+Layout/IndentFirstHashElement:
   EnforcedStyle: consistent
 Layout/MultilineMethodCallIndentation:
   EnforcedStyle: indented

Gemfile

@@ -26,9 +26,8 @@ group :test do
   gem "nokogiri", "~> 1.7"
   gem "rspec"
   gem "rspec-mocks"
-  # Temporary lock on RuboCop version for Windows since Pysch-3.1.0 is not available
+  gem "rubocop", "~> 0.68.0"
-  # for use on Ruby 2.6-mingw32 platforms
+  gem "rubocop-performance"
-  gem "rubocop", Gem.win_platform? ? "~> 0.64.0" : "~> 0.66.0"
   gem "test-dependency-theme", :path => File.expand_path("test/fixtures/test-dependency-theme", __dir__)
   gem "test-theme", :path => File.expand_path("test/fixtures/test-theme", __dir__)
   gem "test-theme-symlink", :path => File.expand_path("test/fixtures/test-theme-symlink", __dir__)

lib/jekyll/configuration.rb

@@ -199,10 +199,10 @@ module Jekyll
           new_config = read_config_file(config_file)
           configuration = Utils.deep_merge_hashes(configuration, new_config)
         end
-      rescue ArgumentError => err
+      rescue ArgumentError => e
         Jekyll.logger.warn "WARNING:", "Error reading configuration. " \
                      "Using defaults (and options)."
-        warn err
+        warn e
       end
 
       configuration.backwards_compatibilize.add_default_collections

test/helper.rb

@@ -196,8 +196,8 @@ class JekyllUnitTest < Minitest::Test
   rescue Errno::EACCES
     skip "Permission denied for creating a symlink to #{target.inspect} " \
          "on this machine".magenta
-  rescue NotImplementedError => error
+  rescue NotImplementedError => e
-    skip error.to_s.magenta
+    skip e.to_s.magenta
   end
 end