chore(deps): Updated to Theia 1.39.0 (#2144)

- update Theia to `1.39.0`,
 - remove the application packager and fix the security vulnerabilities,
 - bundle the backed application with `webpack`, and
 - enhance the developer docs.

Co-authored-by: Akos Kitta <a.kitta@arduino.cc>
Co-authored-by: per1234 <accounts@perglass.com>

Signed-off-by: Akos Kitta <a.kitta@arduino.cc>

arduino-ide-extension/src/browser/theia/dialogs/dialogs.tsx

@@ -9,7 +9,7 @@ import {
   DisposableCollection,
 } from '@theia/core/lib/common/disposable';
 import { inject, injectable } from '@theia/core/shared/inversify';
-import * as React from '@theia/core/shared/react';
+import React from '@theia/core/shared/react';
 import { createRoot } from '@theia/core/shared/react-dom/client';
 
 @injectable()