Update sass requirement from ^1.77.8 to ^1.81.0 in /src

[dependabot]

Updates the requirements on sass to permit the latest version.

Release notes

Sourced from sass's releases.

Dart Sass 1.81.0

To install Sass 1.81.0, download one of the packages below and add it to your PATH, or see the Sass website for full installation instructions.

Changes

• Fix a few cases where deprecation warnings weren't being emitted for global built-in functions whose names overlap with CSS calculations.

• Add support for the CSS round() calculation with a single argument, as long as that argument might be a unitless number.

See the full changelog for changes in earlier releases.

Changelog

Sourced from sass's changelog.

1.81.0

• Fix a few cases where deprecation warnings weren't being emitted for global built-in functions whose names overlap with CSS calculations.

• Add support for the CSS round() calculation with a single argument, as long as that argument might be a unitless number.

1.80.7

Embedded Host

• Don't treat 0 as undefined for the green and blue channels in the LegacyColor constructor.

1.80.6

Command-Line Interface

• Make @parcel/watcher an optional dependency so this can still be installed on operating systems where it's unavailable.

1.80.5

Embedded Host

• Don't produce phantom @import deprecations when using an importer with the legacy API.

1.80.4

• No user-visible changes.

1.80.3

• Fix a bug where @import url("...") would crash in plain CSS files.

• Improve consistency of how warnings are emitted by different parts of the compiler. This should result in minimal user-visible changes, but different types of warnings should now respond more reliably to flags like --quiet, --verbose, and --silence-deprecation.

1.80.2

• Fix a bug where deprecation warnings were incorrectly emitted for the plain-CSS invert() function.

1.80.1

• Fix a bug where repeated deprecation warnings were not automatically limited.

... (truncated)

Commits

• 57a6853 Add support for CSS round() with one unitless argument (#2436)
• e400bdd Support @forward in sass-parser (#2435)
• d1fefb6 Add a changelog entry for sass/embedded-host-node#349 (#2434)
• 871aefa Bump immutable from 4.3.7 to 5.0.2 in /package (#2432)
• 3bc8426 Bump immutable from 4.3.7 to 5.0.2 (#2431)
• 01a2148 Bump bufbuild/buf-setup-action in /.github/util/initialize (#2427)
• 39d3726 Lazy load @​parcel/watcher and fallback to chokidar (#2414)
• a9254df Add sass-parser support for the @while rule (#2410)
• df77b66 Bump gts from 5.3.1 to 6.0.2 in /pkg/sass-parser (#2415)
• be0b42a Remove a weird newline in analysis/README.md (#2416)
• Additional commits viewable in compare view

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