update useServer import path from 'graphql-ws/lib/use/ws' to 'graphql-ws/use/ws'

Author: goncalooliveirasilva

src/content/8/en/part8e.md

@@ -464,7 +464,7 @@ The file <i>index.js</i> is changed to:
 ```js
 // highlight-start
 const { WebSocketServer } = require('ws')
-const { useServer } = require('graphql-ws/lib/use/ws')
+const { useServer } = require('graphql-ws/use/ws')
 // highlight-end
 
 // ...

src/content/8/fi/osa8e.md

@@ -468,7 +468,7 @@ Tiedosto <i>index.js</i> muuttuu seuraavasti
 ```js
 // highlight-start
 const { WebSocketServer } = require('ws')
-const { useServer } = require('graphql-ws/lib/use/ws')
+const { useServer } = require('graphql-ws/use/ws')
 // highlight-end
 
 // ...