Update codeowners for rich-text components

[m-akinc]

Pull Request

🤨 Rationale

vikisekarNI is apparently no longer a valid owner, so replacing with vivinkrishna-ni.

👩‍💻 Implementation

See above.

🧪 Testing

N/A

✅ Checklist

• [x] I have updated the project documentation to reflect my changes or determined no changes are needed.