Bump gulp-sass from 4.1.1 to 5.0.0 (#74)

* Bump gulp-sass from 4.1.1 to 5.0.0

Bumps [gulp-sass](https://github.com/dlmanning/gulp-sass) from 4.1.1 to 5.0.0.
- [Release notes](https://github.com/dlmanning/gulp-sass/releases)
- [Changelog](https://github.com/dlmanning/gulp-sass/blob/master/CHANGELOG.md)
- [Commits](dlmanning/gulp-sass@v4.1.1...v5.0.0)

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

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

* Fix

* Fixed dependency

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Felix Kleinekathoefer <[email protected]>

Author: dependabot[bot]

gulpfile.js

@@ -11,7 +11,7 @@ const
     htmlmin = require('gulp-htmlmin'),
 
     // CSS
-    sass = require('gulp-sass'),
+    sass = require('gulp-sass')(require('sass')),
     postcss = require('gulp-postcss'),
     autoprefixer = require('autoprefixer'),
     cleanCSS = require('gulp-clean-css'),