Bump gulp-sass from 5.1.0 to 6.0.0

Bumps [gulp-sass](https://github.com/dlmanning/gulp-sass) from 5.1.0 to 6.0.0.
- [Release notes](https://github.com/dlmanning/gulp-sass/releases)
- [Changelog](https://github.com/dlmanning/gulp-sass/blob/master/CHANGELOG.md)
- [Commits](dlmanning/gulp-sass@v5.1.0...v6.0.0)

---
updated-dependencies:
- dependency-name: gulp-sass
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -16,7 +16,7 @@
         "gulp-babel": "^8.0.0",
         "gulp-clean-css": "^4.3.0",
         "gulp-cli": "^3.0.0",
-        "gulp-sass": "^5.1.0",
+        "gulp-sass": "^6.0.0",
         "gulp-sourcemaps": "^3.0.0",
         "minimist": "^1.2.8",
         "sass": "^1.82.0",