build(deps-dev): bump sass from 1.98.0 to 1.99.0

Bumps [sass](https://github.com/sass/dart-sass) from 1.98.0 to 1.99.0.
- [Release notes](https://github.com/sass/dart-sass/releases)
- [Changelog](https://github.com/sass/dart-sass/blob/main/CHANGELOG.md)
- [Commits](sass/dart-sass@1.98.0...1.99.0)

---
updated-dependencies:
- dependency-name: sass
  dependency-version: 1.99.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

package-lock.json

@@ -79,7 +79,7 @@
     "react-dom": "^19.2.4",
     "react-final-form": "^7.0.0",
     "rumdl": "0.1.66",
-    "sass": "^1.98.0",
+    "sass": "^1.99.0",
     "starlight-image-zoom": "^0.13.0",
     "starlight-links-validator": "^0.19.2",
     "starlight-llms-txt": "0.7.0",