Bump undici, @sveltejs/adapter-auto and @sveltejs/kit in /tests/app/rp

Removes [undici](https://github.com/nodejs/undici). It's no longer used after updating ancestor dependencies [undici](https://github.com/nodejs/undici), [@sveltejs/adapter-auto](https://github.com/sveltejs/kit/tree/HEAD/packages/adapter-auto) and [@sveltejs/kit](https://github.com/sveltejs/kit/tree/HEAD/packages/kit). These dependencies need to be updated together.


Removes `undici`

Updates `@sveltejs/adapter-auto` from 2.0.1 to 3.1.1
- [Release notes](https://github.com/sveltejs/kit/releases)
- [Changelog](https://github.com/sveltejs/kit/blob/main/packages/adapter-auto/CHANGELOG.md)
- [Commits](https://github.com/sveltejs/kit/commits/@sveltejs/[email protected]/packages/adapter-auto)

Updates `@sveltejs/kit` from 1.30.3 to 2.5.0
- [Release notes](https://github.com/sveltejs/kit/releases)
- [Changelog](https://github.com/sveltejs/kit/blob/main/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/adapter-auto"
  dependency-type: direct:development
- dependency-name: "@sveltejs/kit"
  dependency-type: direct:development
...

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

tests/app/rp/package.json

@@ -12,8 +12,8 @@
 		"format": "prettier --plugin-search-dir . --write ."
 	},
 	"devDependencies": {
-		"@sveltejs/adapter-auto": "^2.0.0",
-		"@sveltejs/kit": "^1.30.3",
+		"@sveltejs/adapter-auto": "^3.1.1",
+		"@sveltejs/kit": "^2.5.0",
 		"prettier": "^2.8.0",
 		"prettier-plugin-svelte": "^2.8.1",
 		"svelte": "^3.54.0",