chore(deps-dev): bump sass from 1.80.4 to 1.80.6 in /backend

Bumps [sass](https://github.com/sass/dart-sass) from 1.80.4 to 1.80.6.
- [Release notes](https://github.com/sass/dart-sass/releases)
- [Changelog](https://github.com/sass/dart-sass/blob/main/CHANGELOG.md)
- [Commits](sass/dart-sass@1.80.4...1.80.6)

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

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

backend/package.json

@@ -71,7 +71,7 @@
         "prettier": "^3.3.3",
         "prettier-plugin-svelte": "^3.2.7",
         "prettier-plugin-tailwindcss": "^0.6.8",
-        "sass": "^1.80.4",
+        "sass": "^1.80.6",
         "svelte": "^5.1.4",
         "svelte-file-dropzone": "^2.0.9",
         "svelte-gestures": "^5.0.6",