Bump @sveltejs/kit from 2.8.3 to 2.20.6 in /tests/app/rp

Bumps [@sveltejs/kit](https://github.com/sveltejs/kit/tree/HEAD/packages/kit) from 2.8.3 to 2.20.6.
- [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: "@sveltejs/kit"
  dependency-version: 2.20.6
  dependency-type: direct:development
...

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

Author: dependabot[bot]

tests/app/rp/package-lock.json

@@ -14,7 +14,7 @@
 	"devDependencies": {
 		"@sveltejs/adapter-auto": "^3.1.1",
 		"@sveltejs/adapter-node": "^5.0.1",
-		"@sveltejs/kit": "^2.8.3",
+		"@sveltejs/kit": "^2.20.6",
 		"prettier": "^3.3.2",
 		"prettier-plugin-svelte": "^3.2.4",
 		"svelte": "^4.2.19",