Dart-sass

* Fix an issue where source locations tracked through variable references could
potentially become incorrect.
* Fix a bug where a loud comment in the source can break the source map when
embedding the sources, when using the command-line interface or the legacy JS
API.

* **Potentially breaking change**: Change the order of maps returned by
`map.deep-merge()` to match those returned by `map.merge()`. All keys that
appeared in the first map will now be listed first in the same order they
appeared in that map, followed by any new keys added from the second map.

* Improve the string output of some AST nodes in error messages.

Embedded Sass

* The JS embedded host and the embedded compiler will now properly avoid
resolving imports relative to the current working directory unless `'.'` is
passed as a load path.

* Fix a bug in the JS embedded host's implementation of the legacy JS API where
imports that began with `/` could crash on Windows.

* `extend` now treats [`:where()`] the same as `:is()`.

[`:where()`]: https://developer.mozilla.org/en-US/docs/Web/CSS/:where

Command Line Interface

* Closing the standard input stream will now cause the `--watch` command to stop
running.

Embedded Sass

* Fix a bug where the JS embedded host crashed when invoking a legacy importer
after resolving a relative filesystem import.

* Improve error messages when returning non-`Object` values from legacy
importers.

* Add support for 64-bit ARM releases on Linux.

Embedded Sass

* The embedded compiler now correctly sets the `id` field for all
`OutboundMessage`s.

* Quiet deps mode now silences compiler warnings in mixins and functions that
are defined in dependencies even if they're invoked from application
stylesheets.

* In expanded mode, Sass will now emit colors using `rgb()`, `rbga()`, `hsl()`,
and `hsla()` function notation if they were defined using the corresponding
notation. As per our browser support policy, this change was only done once
95% of browsers were confirmed to support this output format, and so is not
considered a breaking change.

Note that this output format is intended for human readability and not for
interoperability with other tools. As always, Sass targets the CSS
specification, and any tool that consumes Sass's output should parse all
colors that are supported by the CSS spec.

* Fix a bug in which a color written using the four- or eight-digit hex format
could be emitted as a hex color rather than a format with higher browser
compatibility.

* Calculations are no longer simplified within supports declarations