Checklist:

• I've searched in the docs and FAQ for my answer: https://bit.ly/argocd-faq.
• I've included steps to reproduce the bug.
• I've pasted the output of argocd version.

Describe the bug

An AppSet with PullRequest and an AppSet with SCM generator suddenly require tokenRef for GitHub, this looks unintended and is caused by this commit:
9b17495bc2fe7c6f07ed5ac5cc154b3ae9027be9

To Reproduce

Use a SCM generator and a PullRequest generator for GitHub from the official docs without secretRef and 401 will be received.

Expected behavior

It is optional to use secretRef and should work without.

Screenshots

Version

Paste the output from `argocd version` here.

Logs

Paste any relevant application logs here.