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

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

task_opts_unix.go

@@ -21,10 +21,10 @@ package containerd
 
 import (
 	"context"
+	"errors"
 
 	"github.com/containerd/containerd/runtime/linux/runctypes"
 	"github.com/containerd/containerd/runtime/v2/runc/options"
-	"github.com/pkg/errors"
 )
 
 // WithNoNewKeyring causes tasks not to be created with a new keyring for secret storage.