[Snyk] Security upgrade gulp-rtlcss from 1.4.2 to 2.0.0

Solves https://snyk.io/vuln/SNYK-JS-POSTCSS-1255640

package.json

@@ -56,7 +56,7 @@
     "gulp-print": "^5.0.0",
     "gulp-rename": "^1.4.0",
     "gulp-replace": "^1.0.0",
-    "gulp-rtlcss": "^1.3.0",
+    "gulp-rtlcss": "^2.0.0",
     "gulp-tap": "^1.0.1",
     "gulp-uglify": "^3.0.1",
     "inquirer": "^8.2.0",