更新 上传船舶凭证可多选文件上传

src/views/shipInfo/shipDetail.vue

@@ -79,6 +79,7 @@
         <div class="info-line-title">船舶证书</div>
         <el-upload
           drag
+          multiple
           action="https://interface.huihenduo.com.cn/hhd-pat/cos/upload"
           list-type="picture-card"
           :on-preview="handlePictureCardPreview"

src/views/shipOwnerManage/shipOwnerDetail.vue

@@ -170,6 +170,7 @@
         <div class="info-line-title">船舶证书</div>
         <el-upload
           drag
+          multiple
           action="https://interface.huihenduo.com.cn/hhd-pat/cos/upload"
           list-type="picture-card"
           :on-preview="handlePictureCardPreview"