Update dependency @sveltejs/kit to v2.21.3

frontend/package-lock.json

@@ -1073,9 +1073,9 @@
       }
     },
     "node_modules/@sveltejs/kit": {
-      "version": "2.21.2",
-      "resolved": "https://registry.npmjs.org/@sveltejs/kit/-/kit-2.21.2.tgz",
-      "integrity": "sha512-EMYTY4+rNa7TaRZYzCqhQslEkACEZzWc363jOYuc90oJrgvlWTcgqTxcGSIJim48hPaXwYlHyatRnnMmTFf5tA==",
+      "version": "2.21.3",
+      "resolved": "https://registry.npmjs.org/@sveltejs/kit/-/kit-2.21.3.tgz",
+      "integrity": "sha512-Bd05srNOaqP05qnytjg/KkWNlkcwEpE76s0xGSlgzL4I8pLyrK3c9+a7zMCquoiEEIZF2ecGTn6Fj/lELjaa8A==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -1090,7 +1090,8 @@
         "mrmime": "^2.0.0",
         "sade": "^1.8.1",
         "set-cookie-parser": "^2.6.0",
-        "sirv": "^3.0.0"
+        "sirv": "^3.0.0",
+        "vitefu": "^1.0.6"
       },
       "bin": {
         "svelte-kit": "svelte-kit.js"