Remove deprecated platforms package

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

core/images/handlers.go

@@ -24,7 +24,7 @@ import (
 
 	"github.com/containerd/containerd/v2/core/content"
 	"github.com/containerd/containerd/v2/pkg/errdefs"
-	"github.com/containerd/containerd/v2/platforms"
+	"github.com/containerd/platforms"
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
 	"golang.org/x/sync/errgroup"
 	"golang.org/x/sync/semaphore"