[$] Rolling stable kernels

Sasha Levin, one of the maintainers of the stable kernels, gave apresentation atOpenSource Summit North America 2021 on a proposal for a different way tohandle the stable tree. He noted that throughout most of the kernel's history,version numbers did not really mean anything, but that the versioningscheme suggests that they do, which leads to a disconnect between how thekernels are seen versus how they are actually maintained. He proposedmaking a "rolling stable" release that provides users what they need-timely fixes to their kernel-without forcingthem to choose to switch to a new version number.