Bump sass from 1.67.0 to 1.68.0

Bumps [sass](https://github.com/sass/dart-sass) from 1.67.0 to 1.68.0.
- [Release notes](https://github.com/sass/dart-sass/releases)
- [Changelog](https://github.com/sass/dart-sass/blob/main/CHANGELOG.md)
- [Commits](sass/dart-sass@1.67.0...1.68.0)

---
updated-dependencies:
- dependency-name: sass
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -21,7 +21,7 @@
     "@x-govuk/govuk-eleventy-plugin": "^5.0.4",
     "http-server": "^14.1.1",
     "rimraf": "^5.0.1",
-    "sass": "^1.67.0"
+    "sass": "^1.68.0"
   },
   "devDependencies": {
     "standard": "^17.1.0",