remove duplicate in common-chat's pom

ruoyi-common/ruoyi-common-chat/pom.xml

@@ -102,10 +102,6 @@
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
         </dependency>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-        </dependency>
 
         <dependency>
             <groupId>cn.bigmodel.openapi</groupId>