meta: update dependency sass to v1.64.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
sass	1.63.6 -> 1.64.0

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Release Notes

sass/dart-sass (sass)

v1.64.0

Compare Source

• Comments that appear before or between @use and @forward rules are now
  emitted in source order as much as possible, instead of always being emitted
  after the CSS of all module dependencies.

• Fix a bug where an interpolation in a custom property name crashed if the file
  was loaded by a @use nested in an @import.

JavaScript API

• Add a new SassCalculation type that represents the calculation objects added
  in Dart Sass 1.40.0.

• Add Value.assertCalculation(), which returns the value if it's a
  SassCalculation and throws an error otherwise.

• Produce a better error message when an environment that supports some Node.js
  APIs loads the browser entrypoint but attempts to access the filesystem.

Embedded Sass

• Fix a bug where nested relative @imports failed to load when using the
  deprecated functions render or renderSync and those relative imports were
  loaded multiple times across different files.

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