Update dependency sass to v1.87.0

This MR contains the following updates:

Package	Type	Update	Change
sass	dependencies	minor	1.85.1 -> 1.87.0

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Release Notes

sass/dart-sass (sass)

v1.87.0

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• Potentially breaking bug fix: When a plain CSS file with a top-level nesting selector & is loaded into a nested Sass context via meta.load-css() or @import, Sass now emits plain CSS nesting rather than incorrectly combining it with the parent selector using a descendant combinator.

v1.86.3

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• Fix a bug introduced in 1.86.1 where Sass fails to resolve paths starting with a .. segment.

v1.86.2

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• No user-visible changes.

v1.86.1

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• Improve the performance of file: URL case canonicalization on Windows and Mac OS.

v1.86.0

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• Add support for % as an expression in its own right. It will still be parsed as the modulo operator when between two other expressions, but in any other context it will be an expression whose value is the unquoted string %.

• Consider attr() to be a special number function that can be used as a channel in color functions.

• Deprecate user-defined functions named type() so that we can eventually support the new CSS type() function.

Dart API

• Increase the minimum Dart SDK to 3.6.0.

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