Update dependency postcss-nested to v9

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
postcss-nested	7.0.2 → 9.0.0

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Release Notes

postcss/postcss-nested (postcss-nested)

v9.0.0

Compare Source

• Fixed compatibility with Sass nested and CSS nesting (by @​wahidrizka).
  See #​176 and #​179.

v8.0.1

Compare Source

• Fixed DEP0151 warning in Node.js.

v8.0.0

Compare Source

• Added npm provenance.
• Moved to ESM.
• Dropped Node.js 18 and 20 support.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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