Fix `declaration-property-value-keyword-no-deprecated` false positives for arguments of unknown functions

[Mouvedia]

Which issue, if any, is this issue related to?

Closes #8575

Is there anything in the PR that needs further explanation?

N/A

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 298a28255937f48ba70eba46a7def89346fe663c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
stylelint	Patch

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[github-actions[bot]]

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[Mouvedia]

@romainmenke concerning https://github.com/stylelint/stylelint/pull/8579#discussion_r2094103844 Is the recursive approach that I went with sufficient for you? If not, you can try your hand using @csstools packages instead since Iv allowed edits by maintainers.