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>

app/lib/formatter.rb

@@ -135,6 +135,7 @@ class Formatter
     end
   end
 
+  # rubocop:disable Metrics/BlockNesting
   def encode_custom_emojis(html, emojis, animate = false)
     return html if emojis.empty?
 
@@ -189,6 +190,7 @@ class Formatter
 
     html
   end
+  # rubocop:enable Metrics/BlockNesting
 
   def rewrite(text, entities)
     text = text.to_s