optimize ruturn render image data

package.json

@@ -1,6 +1,6 @@
 {
   "name": "yz-yuki-plugin",
-  "version": "1.0.3-rc.4",
+  "version": "1.0.3-rc.5",
   "description": "优纪插件，yunzaijs 关于 微博推送、B站推送 等功能的拓展插件",
   "author": "snowtafir",
   "type": "module",

src/utils/puppeteer.render.ts

@@ -134,6 +134,9 @@ export class YukiPuppeteerRender extends Puppeteer {
         numSun++; // 增加截图次数
 
         if (buff !== false) {
+          if (!Buffer.isBuffer(buff)) {
+            buff = Buffer.from(buff)
+          }
           /** 计算图片大小 */
           const kb = (buff?.length / 1024).toFixed(2) + "kb"; // 计算图片大小