Remove accidentally added dependency

Author: jakezatecky

package.json

@@ -57,7 +57,6 @@
     "gulp-header": "^2.0.5",
     "gulp-less": "^4.0.1",
     "gulp-mocha": "^8.0.0",
-    "gulp-sass": "^4.1.0",
     "gulp-stylelint": "^13.0.0",
     "jsdom": "^16.0.1",
     "mocha": "^9.0.0",