rename og image to attempt to refresh twitter cache

Author: dwelle

content/blog/webex-integration/webex.png renamed to content/blog/webex-integration/excalidraw_webex.png

@@ -3,7 +3,7 @@ title: Introducing Webex Integration
 date: 2021-10-28
 author: Aakansha, David
 link: https://twitter.com/aakansha1216, https://twitter.com/dluzar
-image: webex.png
+image: excalidraw_webex.png
 ---
 
 Collaborate using Excalidraw whiteboard directly in your Webex meetings.