2.0.22 just released 40 minutes ago. This also updates the `Dockerfile` to use the URL from the GitHub releases page, instead of SDL's servers. I've also pushed a new Docker container to `ghcr.io/infoteddy/vvvvvv-build`.
Dockerfile
Now that it is the minimum version, our CentOS container needs this updated version too.
This is so future CentOS images will be generated with the new SDL version.