fix: update contributors

Author: yanglbme

.github/workflows/contributors.yml

@@ -152,7 +152,7 @@
 
 感谢以下所有朋友对本项目的贡献！
 
-<a href="https://github.com/doocs/leetcode/graphs/contributors" target="_blank"><img src="https://cdn.jsdelivr.net/gh/doocs/leetcode@main/images/contributors.svg" /></a>
+<a href="https://github.com/doocs/leetcode/graphs/contributors" target="_blank"><img src="./images/contributors.svg" /></a>
 
 ## 赞助者
 

README.md

@@ -146,7 +146,7 @@ You can also contribute to [doocs/leetcode](https://github.com/doocs/leetcode) u
 
 This project exists thanks to all the people who contribute.
 
-<a href="https://github.com/doocs/leetcode/graphs/contributors" target="_blank"><img src="https://cdn.jsdelivr.net/gh/doocs/leetcode@main/images/contributors.svg" /></a>
+<a href="https://github.com/doocs/leetcode/graphs/contributors" target="_blank"><img src="./images/contributors.svg" /></a>
 
 ## Backers & Sponsors