Bump sass from 1.67.0 to 1.68.0 (#661)

Author: dependabot[bot]

package.json

@@ -25,7 +25,7 @@
     "grunt-terser": "2.0.0",
     "load-grunt-tasks": "5.1.0",
     "postcss": "8.4.30",
-    "sass": "1.67.0",
+    "sass": "1.68.0",
     "stylelint": "15.10.3",
     "stylelint-config-standard-scss": "11.0.0",
     "stylelint-order": "6.0.3"