Circle CI Lint Broken

Currently, the linter appears to not be able to check out the code, which means this check fails. At a glance it seems to be regarding the publickey used, I am also a bit surprised to see it print this out in the log but perhaps that is not an issue.

Using SSH Config Dir '/home/circleci/.ssh'
git version 2.37.1
Cloning git repository
Cloning into '.'...
Warning: Permanently added the ECDSA host key for IP address '140.82.113.3' to the list of known hosts.
git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository

It appears to have been the case since circa 3 months, and perhaps since this was added: