Update dependency sass to v1.69.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
sass	1.68.0 -> 1.69.0

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Release Notes

sass/dart-sass (sass)

v1.69.0

Compare Source

• Add a meta.get-mixin() function that returns a mixin as a first-class Sass
  value.

• Add a meta.apply() mixin that includes a mixin value.

• Add a meta.module-mixins() function which returns a map from mixin names in
  a module to the first-class mixins that belong to those names.

• Add a meta.accepts-content() function which returns whether or not a mixin
  value can take a content block.

• Add support for the relative color syntax from CSS Color 5. This syntax
  cannot be used to create Sass color values. It is always emitted as-is in the
  CSS output.

Dart API

• Deprecate Deprecation.calcInterp since it was never actually emitted as a
  deprecation.

Embedded Sass

• Fix a rare race condition where the embedded compiler could freeze when a
  protocol error was immediately followed by another request.

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