fix: Input.Group align in Form.Item

[afc163]

🤔 This is a ...

• New feature
• Bug fix
• Site / document update
• Component style update
• TypeScript definition update
• Refactoring
• Code style optimization
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🔗 Related issue link

💡 Background and solution

No more override css hacks.

to

📝 Changelog

Language	Changelog
🇺🇸 English
🇨🇳 Chinese	修复 Form 下 Input.Group 偏上一像素的问题。

☑️ Self Check before Merge

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• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

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[codecov]

Codecov Report

Merging #20681 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #20681   +/-   ##
=======================================
  Coverage   97.54%   97.54%           
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  Files         295      295           
  Lines        6836     6836           
  Branches     1855     1888   +33     
=======================================
  Hits         6668     6668           
  Misses        168      168

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[afc163]

close #20616 in 3.x too.