Move errdefs to pkg/errdefs

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

plugins/services/introspection/introspection.go

@@ -20,7 +20,7 @@ import (
 	context "context"
 
 	api "github.com/containerd/containerd/v2/api/services/introspection/v1"
-	"github.com/containerd/containerd/v2/errdefs"
+	"github.com/containerd/containerd/v2/pkg/errdefs"
 	ptypes "github.com/containerd/containerd/v2/protobuf/types"
 	"github.com/containerd/log"
 )