FIX: typo in hiring

Author: hyeondo-jang

hiring.html

@@ -152,7 +152,7 @@ <h2>Internship</h2>
 
 <ul>
     <li>It allows us to get to know each other and lets you experience the lab firsthand.</li>
-    <li>We rarely hire students I haven't worked with before.</li>
+    <li>We rarely hire students we haven't worked with before.</li>
     <li>The POSTECH admission process is highly competitive, and a positive internship record can significantly strengthen your application.</li>
 </ul>