Bump assets/syntaxes/02_Extra/SCSS_Sass from 63819a1 to d3d9404 (#1766)

* Bump assets/syntaxes/02_Extra/SCSS_Sass from `63819a1` to `d3d9404`

Bumps [assets/syntaxes/02_Extra/SCSS_Sass](https://github.com/braver/SublimeSass) from `63819a1` to `d3d9404`.
- [Release notes](https://github.com/braver/SublimeSass/releases)
- [Commits](https://github.com/braver/SublimeSass/compare/63819a1ab6b2075360933b2cfe41b416de0e3c26...d3d94046409db6fbbc9d51dea52b589ecc9d3d48)

---
updated-dependencies:
- dependency-name: assets/syntaxes/02_Extra/SCSS_Sass
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

* Update regression test and add CHANGELOG.md entry

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Martin Nordholts <enselic@gmail.com>

CHANGELOG.md

@@ -41,6 +41,7 @@
 - MediaWiki, see #1925 (@sorairolake)
 - The `requirements.txt` syntax has been removed due to incompatible license requirements.
 - Dart, new highlighter, see #1959 (@Ersikan)
+- SCSS and Sass syntaxes updated, see #1766 (@Enselic)
 
 ## New themes