Update dependency 3 (#5344)

* update react react-dom prop-types

* update seafile-editor version

* install deep-copy denpendency

* update router version

* repair focus bug

* optimize code

* optimize code

frontend/src/pages/sys-admin/info.js

@@ -13,12 +13,12 @@ class Info extends Component {
 
   constructor(props) {
     super(props);
-    this.fileInput = React.createRef();
     this.state = {
       loading: true,
       errorMsg: '',
       sysInfo: {}
     };
+    this.fileInput = React.createRef();
   }
 
   componentDidMount () {