Update arxiv link

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-                        <a href="https://github.com/KU-CVLAB/gaussiantalker">
+                        <a href="https://arxiv.org/abs/2404.16012v2">
                             <img src="./imgs/icons/Paper1.jpg" height="60px">
                             <h4><strong>Paper</strong></h4>
                         </a>