fix(deps): update dependency postcss to ^8.5.20

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
postcss (source)	^8.5.15 → ^8.5.20

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Release Notes

postcss/postcss (postcss)

v8.5.20

Compare Source

• Fixed missing space if AtRule#params is set after (by @​sarathfrancis90).
• Fixed mixing AST error on warnings (by @​MahinAnowar).

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Configuration

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[coderabbitai]

📝 Walkthrough

Walkthrough

项目将 package.json 中的 postcss 依赖版本约束从 ^8.5.15 更新为 ^8.5.20。

Changes

PostCSS 依赖更新

Layer / File(s)	Summary
更新 PostCSS 版本 package.json	将 dependencies.postcss 的版本约束更新为 ^8.5.20。

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested labels: dependencies

Suggested reviewers: saoutax

Poem

小兔蹦跳捧胡萝卜，
PostCSS 版本向前跑。
8.5.20 亮晶晶，
依赖更新轻又巧。
代码花园更稳牢。

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	标题准确概括了本次将 postcss 依赖升级到 ^8.5.20 的主要变更。

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch renovate/postcss-8.x

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