update to blueprintjs 5.x

src/app/alerts/UpdateServerFailure.tsx

@@ -2,6 +2,7 @@
 // Copyright (c) 2022-2023 The Pybricks Authors
 
 import { Intent } from '@blueprintjs/core';
+import { Error } from '@blueprintjs/icons';
 import React from 'react';
 import type { CreateToast } from '../../toasterTypes';
 import { useI18n } from './i18n';
@@ -13,7 +14,7 @@ const UpdateServerFailure: React.FunctionComponent = () => {
 
 export const updateServerFailure: CreateToast = (onAction) => ({
     message: <UpdateServerFailure />,
-    icon: 'error',
+    icon: <Error />,
     intent: Intent.DANGER,
     onDismiss: () => onAction('dismiss'),
 });