fix: Avatar group responsive font not working

[laishiwen]

[中文版模板 / Chinese template]

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🔗 Related issue link

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Fonts inside Avatar.Group components support responsive
🇨🇳 Chinese	Avatar.Group 组件内的字体支持响应式

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[laishiwen]

1、Avatar group font-size is invalid in responsive；
2、Font size inheritance private variable is more elegant；

[laishiwen]

修复 Avatar.Group 设置属性 size={ xs: number, sm: number, ...} 在响应式中 Avatar 的字体大小不会跟随变化。

[github-actions]

[laishiwen]

@zombieJ code review

[yoyo837]

CI failed.

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Build	Status	Details	Updated (UTC)
default (Inspect)	✅ No change detected	-	Oct 2, 2023, 10:43 PM

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (c4040ec) 100.00% compared to head (fe04d99) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master    #34722   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          681       681           
  Lines        11519     11519           
  Branches      3095      3095           
=========================================
  Hits         11519     11519           

Files	Coverage Δ
components/avatar/avatar.tsx	100.00% <100.00%> (ø)

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