Output in webhook of workflow are in string format

**Describe the bug**
When I receive a workflow status update, I get the workflow output in string format instead of json format.

**Details**
Conductor version: 3.19.0

**To Reproduce**
Steps to reproduce the behavior:
1. Configure conductor with webhook feature
2. Create workflow
3. Start workflow
4. See request sended has output in string format instead json

**Expected behavior**
Output everywhere should be json