fix: demo 示例调整微信版本 ES+ 转换结果

[imsenyu]

考虑到 wechat 平台默认没有提供 ES+ 转换需要开发者手动开启, demo 先减少对于 async 的使用
wechat 平台，demo 项目已开启「转换ES6」+ 「增强编译」，保持 ES+ 输出格式，但组件保持 ES5

[github-actions]

🎊 PR Preview 2aaf5b6 has been successfully built and deployed to https://ant-design-ant-design-mini-preview-pr-1103.surge.sh

🕐 Build time: 268.63s

_{🤖 By surge-preview}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (89582a7) 89.95% compared to head (c82e215) 89.95%.

❗ Current head c82e215 differs from pull request most recent head 2aaf5b6. Consider uploading reports for the commit 2aaf5b6 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1103   +/-   ##
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  Coverage   89.95%   89.95%           
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  Files         150      150           
  Lines        3672     3672           
  Branches      913      913           
=======================================
  Hits         3303     3303           
  Misses        316      316           
  Partials       53       53           

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[DiamondYuan]

LGTM