chore: 更新版本至 5.1.6，修复样式加载失败问题并优化样式插入逻辑

packages/artplayer-plugin-danmuku/package.json

@@ -1,6 +1,6 @@
 {
     "license": "MIT",
-    "version": "5.1.5",
+    "version": "5.1.6",
     "name": "artplayer-plugin-danmuku",
     "types": "types/artplayer-plugin-danmuku.d.ts",
     "description": "Danmuku plugin for ArtPlayer",