Bump undici and @sveltejs/kit in /tests/app/rp (#1390)

Author: dependabot[bot]

tests/app/rp/package-lock.json

@@ -13,7 +13,7 @@
 	},
 	"devDependencies": {
 		"@sveltejs/adapter-auto": "^2.0.0",
-		"@sveltejs/kit": "^1.5.0",
+		"@sveltejs/kit": "^1.30.3",
 		"prettier": "^2.8.0",
 		"prettier-plugin-svelte": "^2.8.1",
 		"svelte": "^3.54.0",