fix: webhook tasks list error delay

app/models/gitea/webhook_task.rb

@@ -1,7 +1,6 @@
 class Gitea::WebhookTask < Gitea::Base 
   serialize :payload_content, JSON
   serialize :request_content, JSON
-  serialize :response_content, JSON
 
   self.inheritance_column = nil
 
@@ -10,4 +9,10 @@ class Gitea::WebhookTask < Gitea::Base
   belongs_to :webhook, class_name: "Gitea::Webhook", foreign_key: :hook_id
 
   enum type: {gogs: 1, slack: 2, gitea: 3, discord: 4, dingtalk: 5, telegram: 6, msteams: 7, feishu: 8, matrix: 9}
+
+  def response_content_json
+    JSON.parse(response_content)
+  rescue 
+    {}
+  end
 end