[kubernetes/kubernetes] Release v1.16.8 - v1.16.8

CRANK

See [kubernetes-announce@](https://groups.google.com/forum/#!forum/kubernetes-announce) and [CHANGELOG/CHANGELOG-1.16.md](https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.16.md#v1168) for details. SHA256 for `kubernetes.tar.gz`: `d79cb0e08ca3ba00fca1657c9951e76d8a870c3bdbaf6018237a62fae81e5634` SHA512 for `kubernetes.tar.gz`: `405aab246b6b49fa6654f982a11af0118ca86d33e84975f26c26e2f09a0781f7578d4ac90f2c889f12c600a93cdc7c57e91e29df6f67b3822573faba889f8fde` Additional binary downloads are linked in the [CHANGELOG/CHANGELOG-1.16.md](https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.16.md#downloads-for-v1168).