Update dependency sass to v1.77.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
sass	1.74.1 -> 1.77.0

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Release Notes

sass/dart-sass (sass)

v1.77.0

Compare Source

• Don't throw errors for at-rules in keyframe blocks.

v1.76.0

Compare Source

• Throw errors for misplaced statements in keyframe blocks.

• Mixins and functions whose names begin with -- are now deprecated for
  forwards-compatibility with the in-progress CSS functions and mixins spec.
  This deprecation is named css-function-mixin.

v1.75.0

Compare Source

• Fix a bug in which stylesheet canonicalization could be cached incorrectly
  when custom importers or the Node.js package importer made decisions based on
  the URL of the containing stylesheet.

JS API

• Allow importer to be passed without url in StringOptionsWithImporter.

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