chore(deps): update dependency stylelint-scss to v6.4.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
stylelint-scss	6.3.2 -> 6.4.0

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Release Notes

stylelint-scss/stylelint-scss (stylelint-scss)

### [`v6.4.0`](https://togithub.com/stylelint-scss/stylelint-scss/blob/HEAD/CHANGELOG.md#640) [Compare Source](https://togithub.com/stylelint-scss/stylelint-scss/compare/v6.3.2...v6.4.0) - Added: `load-partial-extension` rule, and deprecated `at-import-partial-extension` rule ([#​998](https://togithub.com/stylelint-scss/stylelint-scss/issues/998)). - Fixed: `partial-no-import` message to include more accurate rule name ([#​1019](https://togithub.com/stylelint-scss/stylelint-scss/issues/1019)). **Full Changelog**: https://github.com/stylelint-scss/stylelint-scss/compare/v6.3.2...v6.4.0

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