Update demo for svelte 4

demo/package.json

@@ -4,13 +4,13 @@
     "version": "0.0.0",
     "type": "module",
     "devDependencies": {
-        "@sveltejs/vite-plugin-svelte": "^2.0.2",
-        "autoprefixer": "^10.4.13",
-        "postcss": "^8.4.19",
-        "svelte": "^3.55.1",
+        "@sveltejs/vite-plugin-svelte": "^2.4.2",
+        "autoprefixer": "^10.4.14",
+        "postcss": "^8.4.27",
+        "svelte": "^4.1.1",
         "svelte-spa-router": "^3.3.0",
-        "tailwindcss": "^3.2.4",
-        "vite": "^4.1.3"
+        "tailwindcss": "^3.3.3",
+        "vite": "^4.4.6"
     },
     "scripts": {
         "dev": "vite",