Autofix Rubocop Lint/SymbolConversion (#23683)

app/lib/translation_service/deepl.rb

@@ -29,7 +29,7 @@ class TranslationService::DeepL < TranslationService
 
   def request(text, source_language, target_language)
     req = Request.new(:post, endpoint_url, form: { text: text, source_lang: source_language&.upcase, target_lang: target_language, tag_handling: 'html' })
-    req.add_headers('Authorization': "DeepL-Auth-Key #{@api_key}")
+    req.add_headers(Authorization: "DeepL-Auth-Key #{@api_key}")
     req
   end
 

app/services/backup_service.rb

@@ -23,7 +23,7 @@ class BackupService < BaseService
     account.statuses.with_includes.reorder(nil).find_in_batches do |statuses|
       statuses.each do |status|
         item = serialize_payload(ActivityPub::ActivityPresenter.from_status(status), ActivityPub::ActivitySerializer, signer: @account)
-        item.delete(:'@context')
+        item.delete(:@context)
 
         unless item[:type] == 'Announce' || item[:object][:attachment].blank?
           item[:object][:attachment].each do |attachment|