chore: update sponsor custom link

Author: XPoet

.github/FUNDING.yml

@@ -9,4 +9,4 @@ community_bridge: # Replace with a single Community Bridge project-name e.g., cl
 liberapay: # Replace with a single Liberapay username
 issuehunt: # Replace with a single IssueHunt username
 otechie: # Replace with a single Otechie username
-custom: ['https://cdn.staticaly.com/gh/XPoet/image-hosting@master/FE-Cheerleaders/play-tour.png']
+custom: ['https://xpoet.cn/images/reward.png']