Update dependency svelte to v4 [SECURITY]

Author: renovate[bot]

package.json

@@ -18,7 +18,7 @@
     "rollup-plugin-livereload": "^2.0.0",
     "rollup-plugin-svelte": "^7.0.0",
     "rollup-plugin-terser": "^7.0.0",
-    "svelte": "^3.0.0",
+    "svelte": "^4.0.0",
     "svelte-preprocess": "^4.0.0",
     "tailwindcss": "^2.0.2",
     "svelte-check": "^1.0.0",