Update dependency stylelint to v17.6.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
stylelint (source)	17.5.0 → 17.6.0

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Release Notes

stylelint/stylelint (stylelint)

v17.6.0

Compare Source

It adds support for extending units in languageOptions, which then apply to rules like declaration-property-value-no-unknown, and fixes 2 bugs.

• Added: support for extending units to languageOptions (#​9166) (@​jeddy3).
• Fixed: missing ruleMetadata when linting multiple files with overrides (#​9154) (@​kovsu).
• Fixed: custom-property-no-missing-var-function false positives for timeline-scope and animation-timeline (#​9164) (@​splincode).

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