Why Xcode need grant access to this repo ?

Our project integrates Firebase using SPM,  this library is a part of dependencies,  I'm trying Xcode Cloud for our project, but it reports that I need to grant access code source.

<img width="686" height="153" alt="Image" src="https://github.com/user-attachments/assets/3fd27c02-3e4d-47ca-8711-ad8aaf88c2f2" />