Upgrade react-router-dom to v5.3

app/soapbox/components/column_back_button.js

@@ -1,26 +1,25 @@
 import PropTypes from 'prop-types';
 import React from 'react';
 import { FormattedMessage } from 'react-intl';
+import { withRouter } from 'react-router-dom';
 
 import Icon from 'soapbox/components/icon';
 
-export default class ColumnBackButton extends React.PureComponent {
+export default @withRouter
+class ColumnBackButton extends React.PureComponent {
 
   static propTypes = {
     to: PropTypes.string,
-  };
-
-  static contextTypes = {
-    router: PropTypes.object,
+    history: PropTypes.object,
   };
 
   handleClick = () => {
     const { to } = this.props;
 
     if (window.history?.length === 1) {
-      this.context.router.history.push(to ? to : '/');
+      this.props.history.push(to ? to : '/');
     } else {
-      this.context.router.history.goBack();
+      this.props.history.goBack();
     }
   }