Comment 35 for bug 2036873

> Does that mean we should remove the unsupported versions?

The unsupported versions are required for bootstrapping the next version, e.g. openjdk-19 is required to build openjdk-20, and openjdk-20 is required for building openjdk-21.
If we have openjdk-21 in the archive, then technically we do not need openjdk-19, since if we ever publish openjdk-21 containing a critical bug that does not allow to build a fix, we still can rely on openjdk20.