Dockerfile: update containerd to v1.7.0-beta.4, v1.6.18

Signed-off-by: Akihiro Suda <[email protected]>

Author: AkihiroSuda

Dockerfile

@@ -1,9 +1,9 @@
 # syntax=docker/dockerfile-upstream:master
 
 ARG RUNC_VERSION=v1.1.4
-ARG CONTAINERD_VERSION=v1.7.0-beta.3
+ARG CONTAINERD_VERSION=v1.7.0-beta.4
 # containerd v1.6 for integration tests
-ARG CONTAINERD_ALT_VERSION_16=v1.6.16
+ARG CONTAINERD_ALT_VERSION_16=v1.6.18
 ARG REGISTRY_VERSION=2.8.0
 ARG ROOTLESSKIT_VERSION=v1.0.1
 ARG CNI_VERSION=v1.2.0