Earlier this year I raised the topic on RediStack and Repository Mirroring to gauge public opinion on how/where to host and mirror the code repo.
On October 1, 2022 I will be moving the source repo on GitLab from my personal namespace to the Swift Server Community GitLab organization.
GitLab should redirect all requests in perpetuity just fine as long as I don't reuse the RediStack project name for a personal project.
Concerning mirroring to GitHub: I will continue to mirror the code to my personal GitHub project for the foreseeable future.
I will continue to post updates regarding any potential changes to the GitHub mirror, but will not be making any changes until at least March 2023.