Sign in with GitHub on feedback.spacelift.io no longer works

Attempting to sign in with GitHub on the feedback site now returns the following error:

Be careful!

The redirect_uri is not associated with this application.

The application might be misconfigured or could be trying to redirect you to a website you weren't expecting.

This is a little bit of a pain as upvoted and tracked feature requests are associated with my GitHub account and not this one (I signed in via Google to post this feedback).