[BUG] CI system not resolving dependencies when using Adyen together with a private repository

[MarcGarciaSunweb]

Describe the bug
Github workflow not resolving dependencies when project has as a dependency Adyen (from 5.2.0) and a private library.

To Reproduce

1. Have a project with the dependencies Adyen (from 5.2.0) and another dependency stored on a private repository on Github
2. Configure a Github workflow to run the following command:

xcodebuild -resolvePackageDependencies -scheme {scheme} -project {projectPath} -disableAutomaticPackageResolution

3. Run the workflow. The workflow would hang forever without being able to complete

Expected behavior
Github workflow is able to resolve package dependencies when having private repositories

Environment

• Mac OS: 15
• Xcode version: 16.2
• Package Management System: SPM
• Adyen Version: >= 5.2.0

Additional context
Upon deeper investigation, the issue is caused by https://github.com/SwiftGen/SwiftGenPlugin which is a dependency that Adyen added on version 5.2.0
When resolving package dependencies having this dependency on the list, the process hangs undefinable if there is another dependency that's stored on a private repository.

The problem has been reproduced with Github Workflows, but has been impossible to reproduce it locally where it solves the dependencies fine.

[descorp]

Hey @MarcGarciaSunweb

What version of swift are you using?
Seem like SwiftGen requires Swift 5.6.