Bump sass from 1.77.8 to 1.78.0

Bumps [sass](https://github.com/sass/dart-sass) from 1.77.8 to 1.78.0.
- [Release notes](https://github.com/sass/dart-sass/releases)
- [Changelog](https://github.com/sass/dart-sass/blob/main/CHANGELOG.md)
- [Commits](sass/dart-sass@1.77.8...1.78.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -23,7 +23,7 @@
   "dependencies": {
     "govuk-frontend": "^5.6.0",
     "jquery": "^3.7.1",
-    "sass": "^1.77.8"
+    "sass": "^1.78.0"
   },
   "devDependencies": {
     "cypress": "11.2.0",