[WIP] go.mod: github.com/containerd/containerd/v2 v2.0.0-rc.0

[AkihiroSuda]

$ go build ./...
# github.com/containerd/nerdctl/v2/pkg/imgutil
pkg/imgutil/imgutil.go:231:53: cannot use imgcryptUnpackOpt (variable of type containerd.UnpackOpt) as "github.com/containerd/containerd/v2/client".UnpackOpt value in array or slice literal
pkg/imgutil/snapshotter.go:114:9: cannot use source.AppendExtraLabelsHandler(prefetchSize, f) (value of type func("github.com/containerd/containerd/images".Handler) "github.com/containerd/containerd/images".Handler) as func("github.com/containerd/containerd/v2/core/images".Handler) "github.com/containerd/containerd/v2/core/images".Handler value in return statement
pkg/imgutil/snapshotter.go:114:55: cannot use f (variable of type func("github.com/containerd/containerd/v2/core/images".Handler) "github.com/containerd/containerd/v2/core/images".Handler) as func("github.com/containerd/containerd/images".Handler) "github.com/containerd/containerd/images".Handler value in argument to source.AppendExtraLabelsHandler
pkg/imgutil/snapshotter.go:118:9: cannot use socisource.AppendDefaultLabelsHandlerWrapper(rFlags.SociIndexDigest, f) (value of type func(f "github.com/containerd/containerd/images".Handler) "github.com/containerd/containerd/images".Handler) as func("github.com/containerd/containerd/v2/core/images".Handler) "github.com/containerd/containerd/v2/core/images".Handler value in return statement
pkg/imgutil/snapshotter.go:118:78: cannot use f (variable of type func("github.com/containerd/containerd/v2/core/images".Handler) "github.com/containerd/containerd/v2/core/images".Handler) as func("github.com/containerd/containerd/images".Handler) "github.com/containerd/containerd/images".Handler value in argument to socisource.AppendDefaultLabelsHandlerWrapper

Depends on:

• go.mod: github.com/containerd/containerd/v2 v2.0.0-rc.1 imgcrypt#148
• Update to containerd 2.0 rc stargz-snapshotter#1545
• soci-snapshotter