Update dependency rubocop-rails to v2.20.1 (#25493)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Renaud Chaput <renchap@gmail.com>

Gemfile.lock

@@ -616,7 +616,7 @@ GEM
     rubocop-performance (1.18.0)
       rubocop (>= 1.7.0, < 2.0)
       rubocop-ast (>= 0.4.0)
-    rubocop-rails (2.19.1)
+    rubocop-rails (2.20.2)
       activesupport (>= 4.2.0)
       rack (>= 1.1)
       rubocop (>= 1.33.0, < 2.0)

app/serializers/web/notification_serializer.rb

@@ -33,7 +33,7 @@ class Web::NotificationSerializer < ActiveModel::Serializer
   end
 
   def body
-    str = strip_tags(object.target_status&.spoiler_text&.presence || object.target_status&.text || object.from_account.note)
+    str = strip_tags(object.target_status&.spoiler_text.presence || object.target_status&.text || object.from_account.note)
     truncate(HTMLEntities.new.decode(str.to_str), length: 140, escape: false) # Do not encode entities, since this value will not be used in HTML
   end
 end