🐛 修复 ExcelUtils 报错

yudao-framework/yudao-spring-boot-starter-excel/src/main/java/cn/iocoder/yudao/framework/excel/core/util/ExcelUtils.java

@@ -38,7 +38,7 @@ public class ExcelUtils {
                 .registerConverter(new LongStringConverter()) // 避免 Long 类型丢失精度
                 .sheet(sheetName).doWrite(data);
         // 设置 header 和 contentType。写在最后的原因是，避免报错时，响应 contentType 已经被修改了
-        response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(filename, StandardCharsets.UTF_8));
+        response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(filename, StandardCharsets.UTF_8.name()));
         response.setContentType("application/vnd.ms-excel;charset=UTF-8");
     }