docs: update leaderboard

Author: gnohgnailoug

omnigirl_leaderboard.html

@@ -48,7 +48,7 @@ <h3 class="fw-light text-nowrap">
       <a href="https://github.com/DeepSoftwareAnalytics/OmniGIRL" target="_blank">
         <img src="https://img.shields.io/badge/github-%23121011.svg?style=for-the-badge&logo=github&logoColor=white" alt="github" class="img-fluid">
       </a>
-      <a href="https://openreview.net/forum?id=yourISSTA25paperID" target="_blank">
+      <a href="https://conf.researchr.org/details/issta-2025/issta-2025-papers/2/OmniGIRL-A-Multilingual-and-Multimodal-Benchmark-for-GitHub-Issue-Resolution" target="_blank">
         <img src="https://img.shields.io/badge/Paper-ISSTA%2725-a55fed.svg?style=for-the-badge" alt="paper" class="img-fluid">
       </a>
       <!-- 新增 arXiv 链接 -->