chore(deps): update dependency sass-embedded to v1.88.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
sass-embedded	1.87.0 -> 1.88.0

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Release Notes

sass/embedded-host-node (sass-embedded)

v1.88.0

Compare Source

• Allow custom properties with empty values (such as --var:;).

• Fix a bug when calculating source spans for interpolations.

Dart and JS APIs

• Potentially breaking bug fix: Throw an error when passing a function or
  mixin object from one compilation to another.

Dart API

• Deprecate passing a relative URL to compileString() and related functions.

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