chore(host-ctr): Update containerd dependency

[gazal-k]

Issue number:

Related to emicklei/go-restful#489 & containerd/containerd#8271

Description of changes:
Updates containerd to the latest 1.6.x release; https://github.com/containerd/containerd/releases/tag/v1.6.20

Testing done:

$ go mod tidy
$ go mod vendor
$ go build ./...
$ ./host-ctr --help
NAME:
   host-ctr - manage host containers
   ...

Terms of contribution:

By submitting this pull request, I agree that this contribution is dual-licensed under the terms of both the Apache License, version 2.0, and the MIT license.

[jpmcb]

Thank you so much for this PR!!

[jpmcb]

You may want to run go mod tidy to get things cleaned up since we don't need the multiline replace anymore. Go should re-format it for you as:

// containerd still uses the v1alpha2 APIs in k8s.io/cri-api.
// These were removed in v0.26 of cri-api resulting in a dependency conflict.
// TODO: Remove this `replace` when containerd uses v1 of the cri-api
replace k8s.io/cri-api => k8s.io/cri-api v0.25.5

[jpmcb]

Hmmm, this line looks like it's adding github.com/emicklei/go-restful v2.9.5 back into the mix.

And it does look like v2.9.5 of go restful is still being brought in somewhere in containerd:
https://github.com/containerd/containerd/blob/2806fc1057397dbaeefbea0e4e17bddfbd388f38/go.sum#L352-L353

Where and how this is being pulled in on the upstream requires more investigation upstream.

[gazal-k]

😞 it seems to be present even in 1.7.0. https://github.com/containerd/containerd/blob/v1.7.0/go.sum

[jpmcb]

Hmmm yeah, just noticed that as well: containerd/containerd#8168

We'll want to follow that upstream. But for now, I'll close this and we can keep an eye on what containerd does

[jpmcb]

@gazal-k - if you want to open a subsequent PR for just the containerd upgrades (without replacing go-restful), I'd be happy to review that