style: change skeleton radius form 4px to --semi-border-radius-small

[YyumeiZhang]

中文模板 / Chinese Template

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• Code style update
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PR description

Fixes #1719

Changelog

🇨🇳 Chinese

• Style: Skeleton 的默认圆角从 4px 修改为 --semi-border-radius-small(3px)

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🇺🇸 English

• Fix: Skeleton's default rounded corners changed from 4px to --semi-border-radius-small(3px)

Checklist

• Test or no need
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• Changelog or no need

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[cypress]

2 failed tests on run #1800 ↗︎

2	210	10	0	0
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Details:

Merge acc60ef into 1393286...
Project: semi-design	Commit: 0389c7eefd ℹ️
Status: Failed	Duration: 12:34 💡
Started: Jul 28, 2023 5:24 AM	Ended: Jul 28, 2023 5:37 AM

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