Update dependency sass to v1.77.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
sass	1.77.1 -> 1.77.3

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Release Notes

sass/dart-sass (sass)

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

Compare Source

• 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.

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