vendor: update containerd/cri to current master

- Remove dependency on libcontainer/system
- Get rid of socat for port forwarding
- Roll docker/distribution back to latest (v2.7.1) release
  Now that 901bcb2231 was merged in containerd,
  we no longer depend on the ParseDockerRef utility from docker/distribution,
  so we can safely roll back to the latest release for this dependency.
- vendor: kubernetes v1.18.2
  Fix client watch reestablishment handling of client-side timeouts
- Add config flag to default empty seccomp profile

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

.github/workflows/ci.yml

@@ -311,8 +311,7 @@ jobs:
             libnl-3-dev \
             libnet-dev \
             libcap-dev \
-            python-future \
-            socat
+            python-future
           wget https://github.com/checkpoint-restore/criu/archive/v3.13.tar.gz -O criu.tar.gz
           tar -zxf criu.tar.gz
           cd criu-3.13