How do we tell which repos are using v3?

[Daniel15]

I got the email about the v3 deprecation:

Artifact actions v3 will be closing down by January 30, 2025. You are receiving this email because you have GitHub Actions workflows using v3 of actions/upload-artifact or actions/download-artifact. After this date using v3 of these actions will result in a workflow failure. Artifacts within their retention period will remain accessible from the UI or REST API regardless of the version used to upload.

How do I determine which of my repos are using v3?