Bump rubocop from 0.86.0 to 0.88.0 (#14412)

* Bump rubocop from 0.86.0 to 0.88.0

Bumps [rubocop](https://github.com/rubocop-hq/rubocop) from 0.86.0 to 0.88.0.
- [Release notes](https://github.com/rubocop-hq/rubocop/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop-hq/rubocop/compare/v0.86.0...v0.88.0)

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

* Fix for latest RuboCop

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Yamagishi Kazutoshi <ykzts@desire.sh>

lib/mastodon/redis_config.rb

@@ -23,7 +23,7 @@ end
 setup_redis_env_url
 setup_redis_env_url(:cache, false)
 
-namespace       = ENV.fetch('REDIS_NAMESPACE') { nil }
+namespace       = ENV.fetch('REDIS_NAMESPACE', nil)
 cache_namespace = namespace ? namespace + '_cache' : 'cache'
 
 REDIS_CACHE_PARAMS = {

lib/mastodon/version.rb

@@ -33,16 +33,16 @@ module Mastodon
     end
 
     def repository
-      ENV.fetch('GITHUB_REPOSITORY') { 'tootsuite/mastodon' }
+      ENV.fetch('GITHUB_REPOSITORY', 'tootsuite/mastodon')
     end
 
     def source_base_url
-      ENV.fetch('SOURCE_BASE_URL') { "https://github.com/#{repository}" }
+      ENV.fetch('SOURCE_BASE_URL', "https://github.com/#{repository}")
     end
 
     # specify git tag or commit hash here
     def source_tag
-      ENV.fetch('SOURCE_TAG') { nil }
+      ENV.fetch('SOURCE_TAG', nil)
     end
 
     def source_url

lib/paperclip/color_extractor.rb

@@ -89,7 +89,7 @@ module Paperclip
       end
     end
 
-    # rubocop:disable Style/MethodParameterName
+    # rubocop:disable Naming/MethodParameterName
     def rgb_to_hsl(r, g, b)
       r /= 255.0
       g /= 255.0
@@ -156,7 +156,7 @@ module Paperclip
 
       [(r * 255).round, (g * 255).round, (b * 255).round]
     end
-    # rubocop:enable Style/MethodParameterName
+    # rubocop:enable Naming/MethodParameterName
 
     def lighten_or_darken(color, by)
       hue, saturation, light = rgb_to_hsl(color.r, color.g, color.b)