build(deps-dev): bump sass from 1.87.0 to 1.91.0 (#139)

Bumps [sass](https://github.com/sass/dart-sass) from 1.87.0 to 1.91.0.
- [Release notes](https://github.com/sass/dart-sass/releases)
- [Changelog](https://github.com/sass/dart-sass/blob/main/CHANGELOG.md)
- [Commits](sass/dart-sass@1.87.0...1.91.0)

---
updated-dependencies:
- dependency-name: sass
  dependency-version: 1.91.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -26,7 +26,7 @@
     "eslint": "^9.23.0",
     "eslint-plugin-vue": "^10.1.0",
     "prettier": "^3.5.3",
-    "sass": "^1.87.0",
+    "sass": "^1.91.0",
     "vite": "^6.3.4"
   }
 }