Switch to new errdefs package

Signed-off-by: Derek McGowan <derek@mcg.dev>

core/sandbox/proxy/controller.go

@@ -23,7 +23,7 @@ import (
 	"github.com/containerd/containerd/v2/api/types"
 	"github.com/containerd/containerd/v2/core/mount"
 	"github.com/containerd/containerd/v2/core/sandbox"
-	"github.com/containerd/containerd/v2/pkg/errdefs"
+	"github.com/containerd/errdefs"
 	"github.com/containerd/platforms"
 	"google.golang.org/protobuf/types/known/anypb"
 )