fix: restore typescript to ^5.9.3 and update lockfile

The template sync downgraded typescript from ^5.9.3 to ^5.6.3.
Restores the original version and updates the lockfile accordingly.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Alexandre Nédélec

package.json

@@ -44,7 +44,7 @@
     "@nuxt/eslint": "^1.15.2",
     "@stefanobartoletti/nuxt-social-share": "^2.3.1",
     "eslint": "^10.1.0",
-    "typescript": "^5.6.3",
+    "typescript": "^5.9.3",
     "vue-tsc": "^3.2.6"
   },
   "packageManager": "pnpm@10.33.0",