package/containerd: security bump to version 1.5.16
CVE-2022-23471: https://github.com/advisories/GHSA-2qjp-425j-52j9
and other bugfixes, see:
https://github.com/containerd/containerd/releases/tag/v1.5.16
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>