Bump undici and @sveltejs/kit in /explorer

Bumps [undici](https://github.com/nodejs/undici) to 5.28.4 and updates ancestor dependency [@sveltejs/kit](https://github.com/sveltejs/kit/tree/HEAD/packages/kit). These dependencies need to be updated together.


Updates `undici` from 5.26.5 to 5.28.4
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](nodejs/undici@v5.26.5...v5.28.4)

Updates `@sveltejs/kit` from 1.27.6 to 1.30.4
- [Release notes](https://github.com/sveltejs/kit/releases)
- [Changelog](https://github.com/sveltejs/kit/blob/@sveltejs/[email protected]/packages/kit/CHANGELOG.md)
- [Commits](https://github.com/sveltejs/kit/commits/@sveltejs/[email protected]/packages/kit)

---
updated-dependencies:
- dependency-name: undici
  dependency-type: indirect
- dependency-name: "@sveltejs/kit"
  dependency-type: direct:development
...

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

Author: dependabot[bot]

explorer/package-lock.json

@@ -13,7 +13,7 @@
 	},
 	"devDependencies": {
 		"@sveltejs/adapter-auto": "^2.0.0",
-		"@sveltejs/kit": "^1.27.4",
+		"@sveltejs/kit": "^1.30.4",
 		"autoprefixer": "^10.4.16",
 		"postcss": "^8.4.31",
 		"prettier": "^3.0.0",