Dockerfile: update containerd, registry, RootlessKit, CNI
Dockerfile: update containerd, registry, RootlessKit, CNI

- containerd: 1.6.0/1.5.9/1.4.12 -> 1.6.1/1.5.10/1.4.13
- registry: 2.7.1 -> 2.8.0
- RootlessKit: 0.14.2 -> 0.14.6
- CNI plugins: 1.0.1 -> 1.1.0

Signed-off-by: Akihiro Suda <10ddef0dea2a66ab193b07198faa879adcb213d8@hco.ntt.co.jp>

tonistiigi/buildkit_poc,tonistiigi/buildkit_poc