Merge pull request #1042 from eXist-db/dependabot/npm_and_yarn/gulp-sass-6.0.0

chore(deps-dev): bump gulp-sass from 5.1.0 to 6.0.0

Author: duncdrum

package-lock.json

@@ -42,7 +42,7 @@
     "gulp-muxml": "^2.0.0",
     "gulp-optimize-js": "^1.1.0",
     "gulp-rename": "^2.0.0",
-    "gulp-sass": "^5.1.0",
+    "gulp-sass": "^6.0.0",
     "gulp-sourcemaps": "^3.0.0",
     "gulp-standard": "^14.0.0",
     "gulp-svgmin": "^4.1.0",