iAPI Router: add missing changelog entry for #68923

[DAreRodz]

The following PR was merged without a proper changelog entry:

• iAPI Router: Fix CSS rule order in some constructed style sheets #68923

This PR adds it.

[github-actions]

Flaky tests detected in cd6c187.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/13037909287
📝 Reported issues:

• [Flaky Test] Navigates from items list to preview via TAB, and vice versa #62434 in /test/e2e/specs/site-editor/dataviews-list-layout-keyboard.spec.js

[Mamaduka]

Thanks for the follow, @DAreRodz!

[github-actions]

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Co-authored-by: DAreRodz <[email protected]>
Co-authored-by: Mamaduka <[email protected]>

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