fix 修复 jdk8 与 jdk11 差异问题

ruoyi-oss/src/main/java/com/ruoyi/system/controller/SysOssController.java

@@ -93,7 +93,7 @@ public class SysOssController extends BaseController {
 		response.reset();
 		response.addHeader("Access-Control-Allow-Origin", "*");
 		response.addHeader("Access-Control-Expose-Headers", "Content-Disposition");
-		FileUtils.setAttachmentResponseHeader(response, URLEncoder.encode(sysOss.getOriginalName(), StandardCharsets.UTF_8));
+		FileUtils.setAttachmentResponseHeader(response, URLEncoder.encode(sysOss.getOriginalName(), StandardCharsets.UTF_8.toString()));
 		response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE + "; charset=UTF-8");
 		long data = HttpUtil.download(sysOss.getUrl(), response.getOutputStream(), false);
 		response.setContentLength(Convert.toInt(data));