XSS vulnerability

### Reflected server-side cross-site scripting

Writing user input directly to a web page allows for a cross-site scripting vulnerability.

https://github.com/mem0ai/mem0/blob/main/embedchain/embedchain/bots/slack.py#L81C13-L82C58

`curl -X POST http://127.0.0.1:5000 -H "Content-Type: application/json" -d '{"challenge": "<svg/onload=alert()>"}'`

Remediation:

Output encoding