📝 Description

This PR fixes a CI failure where link validation fails because one of the demo repositories became private.

🛠️ Changes Made

• Remove a private demo from horovod.ipynb

✅ Checklist

• I updated the documentation (if applicable)
• I have tested the changes in this PR
• I confirmed whether my changes are covered by system tests
  • If yes, I ran all relevant system tests and ensured they passed before submitting this PR
  • I updated existing system tests and/or added new ones if needed to cover my changes
• If I introduced a deprecation:
  • I followed the Deprecation Guidelines
  • I updated the relevant Jira ticket for documentation

🧪 Testing

🔗 References

• Ticket link: https://iguazio.atlassian.net/browse/ML-11806
• Design docs links:
• External links: https://github.com/mlrun/mlrun/actions/runs/20411935248/job/58681148150?pr=9043#step:5:1065

🚨 Breaking Changes?

• Yes (explain below)
• No

🔍️ Additional Notes