style: tweak select arrow icon position

[afc163]

[中文版模板 / Chinese template]

🤔 This is a ...

• New feature
• Bug fix
• Site / documentation update
• Demo update
• Component style update
• TypeScript definition update
• Bundle size optimization
• Performance optimization
• Enhancement feature
• Internationalization
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Other (about what?)

🔗 Related issue link

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Tweak Select arrow icon position.
🇨🇳 Chinese	微调 Select 箭头垂直位置。

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

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

[codecov]

Codecov Report

Merging #31234 (cc00fad) into master (27642b2) will not change coverage.
The diff coverage is n/a.

❗ Current head cc00fad differs from pull request most recent head 3e4ad45. Consider uploading reports for the commit 3e4ad45 to get more accurate results

@@            Coverage Diff            @@
##            master    #31234   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          397       397           
  Lines         7564      7564           
  Branches      2133      2133           
=========================================
  Hits          7564      7564           

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[github-actions]

[github-actions]

Size Change: -10 B (0%)

Total Size: 832 kB

Filename	Size	Change
./dist/antd.compact.min.css	64.2 kB	-3 B (0%)
./dist/antd.dark.min.css	65.5 kB	-3 B (0%)
./dist/antd.min.css	64.4 kB	-4 B (0%)

ℹ️ View Unchanged

Filename	Size
./dist/antd-with-locales.min.js	341 kB
./dist/antd.min.js	297 kB

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