Fix deprecation warnings for rails 6.0

lib/account_deleter.rb

@@ -97,6 +97,6 @@ class AccountDeleter
   end
 
   def mark_account_deletion_complete
-    AccountDeletion.find_by(person: person)&.update_attributes(completed_at: Time.now.utc)
+    AccountDeletion.find_by(person: person)&.update(completed_at: Time.now.utc)
   end
 end

lib/diaspora/federation/receive.rb

@@ -116,7 +116,7 @@ module Diaspora
 
         if persisted_photo
           persisted_photo.tap do |photo|
-            photo.update_attributes(
+            photo.update(
               text:                entity.text,
               public:              entity.public,
               created_at:          entity.created_at,
@@ -145,7 +145,7 @@ module Diaspora
 
       def self.profile(entity)
         author_of(entity).profile.tap do |profile|
-          profile.update_attributes(
+          profile.update(
             first_name:       entity.first_name,
             last_name:        entity.last_name,
             image_url:        entity.image_url,