Fix peer server update failure (#9824)

When updating all servers following the constructions of mc update,
only the endpoint server will be updated successfully.
All the other peer servers' updating failed due to the error below:
--------------------------------------------------------------------------
parsing time "2006-01-02T15:04:05Z07:00" as "<release version>": cannot parse "-01-02T15:04:05Z07:00" as "0-" 
--------------------------------------------------------------------------

cmd/peer-rest-server.go

@@ -770,7 +770,7 @@ func (s *peerRESTServer) ServerUpdateHandler(w http.ResponseWriter, r *http.Requ
 	var latestReleaseTime time.Time
 	var err error
 	if latestRelease := vars[peerRESTLatestRelease]; latestRelease != "" {
-		latestReleaseTime, err = time.Parse(latestRelease, time.RFC3339)
+		latestReleaseTime, err = time.Parse(time.RFC3339, latestRelease)
 		if err != nil {
 			s.writeErrorResponse(w, err)
 			return