chore(deps): update dependency sass to v1.77.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
sass	1.75.0 -> 1.77.6

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Release Notes

sass/dart-sass (sass)

v1.77.6

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• Fix a few cases where comments and occasionally even whitespace wasn't allowed
  between the end of Sass statements and the following semicolon.

v1.77.5

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• Fully trim redundant selectors generated by @extend.

v1.77.4

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Embedded Sass

• Support passing Version input for fatalDeprecations as string over
  embedded protocol.

• Fix a bug in the JS Embedded Host where Version could be incorrectly accepted
  as input for silenceDeprecations and futureDeprecations in pure JS.

v1.77.3

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Dart API

• Deprecation.duplicateVariableFlags has been deprecated and replaced with
  Deprecation.duplicateVarFlags to make it consistent with the
  duplicate-var-flags name used on the command line and in the JS API.

v1.77.2

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• Don't emit deprecation warnings for functions and mixins beginning with __.

• Allow user-defined functions whose names begin with _ and otherwise look
  like vendor-prefixed functions with special CSS syntax.

Command-Line Interface

• Properly handle the --silence-deprecation flag.

• Handle the --fatal-deprecation and --future-deprecation flags for
  --interactive mode.

v1.77.1

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• Fix a crash that could come up with importers in certain contexts.

v1.77.0

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

v1.76.0

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• 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.

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