chore: update

src/pages/student/components/uploadCert.vue

@@ -5,6 +5,7 @@
       action="https://webapp-pub.oss-cn-beijing.aliyuncs.com"
       drag
       multiple
+      accept=".pdf"
       :data="uploadData"
       :before-upload="beforeUpload"
       :on-change="onChange"