DEV: Fix rubocop issues (#14715)

lib/tasks/cdn.rake

@@ -20,7 +20,7 @@ task 'assets:prestage' => :environment do |t|
   puts "pre staging: #{assets.join(' ')}"
 
   # makes testing simpler leaving this here
-  config = YAML::load(File.open("#{Rails.root}/config/cdn.yml"))
+  config = YAML::safe_load(File.open("#{Rails.root}/config/cdn.yml"))
 
   start = Time.now
 

lib/tasks/emoji.rake

@@ -284,7 +284,7 @@ desc "update emoji images"
 task "emoji:update" do
   copy_emoji_db
 
-  json_db = open(File.join(GENERATED_PATH, "db.json")).read
+  json_db = File.read(File.join(GENERATED_PATH, "db.json"))
   db = JSON.parse(json_db)
 
   write_db_json(db["emojis"], db["translations"])
@@ -352,7 +352,7 @@ end
 def generate_emoji_groups(keywords, sections)
   puts "Generating groups..."
 
-  list = open(EMOJI_ORDERING_URL).read
+  list = URI.parse(EMOJI_ORDERING_URL).read
   doc = Nokogiri::HTML5(list)
   table = doc.css("table")[0]
 

lib/tasks/themes.rake

@@ -30,7 +30,7 @@ task "themes:install" => :environment do |task, args|
   use_json = theme_args == ''
 
   theme_args = begin
-                 use_json ? JSON.parse(ARGV.last.gsub('--', '')) : YAML::load(theme_args)
+                 use_json ? JSON.parse(ARGV.last.gsub('--', '')) : YAML::safe_load(theme_args)
                rescue
                  puts use_json ? "Invalid JSON input. \n#{ARGV.last}" : "Invalid YML: \n#{theme_args}"
                  exit 1