npm: bump gulp-sass in /web/themes/custom/contribtracker

Bumps [gulp-sass](https://github.com/dlmanning/gulp-sass) from 5.1.0 to 6.0.1.
- [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...v6.0.1)

---
updated-dependencies:
- dependency-name: gulp-sass
  dependency-version: 6.0.1
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

web/themes/custom/contribtracker/package-lock.json

@@ -39,7 +39,7 @@
     "gulp-imagemin": "^9.1.0",
     "gulp-postcss": "^10.0.0",
     "gulp-prettier": "^6.0.0",
-    "gulp-sass": "^5.1.0",
+    "gulp-sass": "^6.0.1",
     "gulp-sass-glob": "^1.1.0",
     "gulp-svgstore": "^9.0.0",
     "gulp-typescript": "^6.0.0-alpha.1",