[SECURITY] Pin dependency svelte to 4.2.20

Author: lucca-renovate[bot]

front/package.json

@@ -15,7 +15,7 @@
     "rollup-plugin-svelte": "^7.2.2",
     "@rollup/plugin-terser": "^0.4.4",
     "rollup-plugin-css-only": "^4.5.2",
-    "svelte": "^4.2.19"
+    "svelte": "4.2.20"
   },
   "dependencies": {
     "sirv-cli": "^2.0.2"