Stable kernel updates

Stable kernels 5.10.71, 5.4.151, 4.19.209, 4.14.249, 4.9.285, and 4.4.286 have been released. They all containimportant fixes and users should upgrade.

Note that 5.14.10has been through more than the usual number of release candidates and isnot yet out; it should show up in the next day or so.