build(deps): bump github.com/containerd/containerd

Bumps [github.com/containerd/containerd](https://github.com/containerd/containerd) from 1.6.0-rc.2 to 1.6.0.
- [Release notes](https://github.com/containerd/containerd/releases)
- [Changelog](https://github.com/containerd/containerd/blob/main/RELEASES.md)
- [Commits](https://github.com/containerd/containerd/compare/v1.6.0-rc.2...v1.6.0)

---
updated-dependencies:
- dependency-name: github.com/containerd/containerd
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

go.mod

@@ -8,7 +8,7 @@ require (
 	github.com/KromDaniel/jonson v0.0.0-20180630143114-d2f9c3c389db
 	github.com/Microsoft/go-winio v0.5.1
 	github.com/containerd/console v1.0.3
-	github.com/containerd/containerd v1.6.0-rc.2
+	github.com/containerd/containerd v1.6.0
 	github.com/docker/buildx v0.6.2
 	github.com/docker/distribution v2.8.0+incompatible
 	github.com/emicklei/proto v1.9.0 // indirect