feat: replace github.com/pkg/errors to errors

Signed-off-by: haoyun <yun.hao@daocloud.io>
Co-authored-by: zounengren <zouyee1989@gmail.com>

container_checkpoint_opts.go

@@ -19,6 +19,7 @@ package containerd
 import (
 	"bytes"
 	"context"
+	"errors"
 	"fmt"
 	"runtime"
 
@@ -31,7 +32,6 @@ import (
 	"github.com/containerd/containerd/runtime/v2/runc/options"
 	"github.com/containerd/typeurl"
 	imagespec "github.com/opencontainers/image-spec/specs-go/v1"
-	"github.com/pkg/errors"
 )
 
 var (