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

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

runtime/v2/process.go

@@ -18,13 +18,13 @@ package v2
 
 import (
 	"context"
+	"errors"
 
 	tasktypes "github.com/containerd/containerd/api/types/task"
 	"github.com/containerd/containerd/errdefs"
 	"github.com/containerd/containerd/runtime"
 	"github.com/containerd/containerd/runtime/v2/task"
 	"github.com/containerd/ttrpc"
-	"github.com/pkg/errors"
 )
 
 type process struct {