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

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

snapshots/devmapper/plugin/plugin.go

@@ -20,10 +20,11 @@
 package plugin
 
 import (
+	"errors"
+
 	"github.com/containerd/containerd/platforms"
 	"github.com/containerd/containerd/plugin"
 	"github.com/containerd/containerd/snapshots/devmapper"
-	"github.com/pkg/errors"
 )
 
 func init() {