Bump gulp-sass from 5.0.0 to 5.1.0

Bumps [gulp-sass](https://github.com/dlmanning/gulp-sass) from 5.0.0 to 5.1.0.
- [Release notes](https://github.com/dlmanning/gulp-sass/releases)
- [Changelog](https://github.com/dlmanning/gulp-sass/blob/master/CHANGELOG.md)
- [Commits](https://github.com/dlmanning/gulp-sass/compare/v5.0.0...v5.1.0)

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

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

package.json

@@ -29,7 +29,7 @@
     "gulp-postcss": "^8.0.0",
     "gulp-rename": "^2.0.0",
     "gulp-run": "^1.7.1",
-    "gulp-sass": "^5.0.0",
+    "gulp-sass": "^5.1.0",
     "gulp-sourcemaps": "^3.0.0",
     "gulp-terser": "^2.1.0",
     "localtunnel": "^2.0.2",