chore: update postcss to ^8.5.18

[benlife5]

GHSA-r28c-9q8g-f849

Vulnerable Package:
postcss 8.4.35

Safe Dependencies:
postcss 8.5.18

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 2493b0df-3056-4c69-aaad-71b00f8ce0c9

📥 Commits

Reviewing files that changed from the base of the PR and between 15a7a6d and a8422f3.

📒 Files selected for processing (2)

• THIRD-PARTY-NOTICES
• packages/pages/THIRD-PARTY-NOTICES

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Walkthrough

The pages package updates its postcss dependency range from ^8.4.35 to ^8.5.18. Third-party notices update the listed PostCSS, source-map-js, and nanoid versions. The PostCSS copyright email is also corrected.

Suggested reviewers: mkilpatrick, briantstephan

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the update of the postcss dependency to version range ^8.5.18.
Description check	✅ Passed	The description identifies the postcss vulnerability and the safe dependency version, which directly relates to the changeset.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch vuln-46034-46035

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