chore(deps): update dependency tsdown to v0.20.3

Author: renovate[bot]

packages/vue-recaptcha/package.json

@@ -85,7 +85,7 @@
     "pinst": "3.0.0",
     "prettier": "3.8.1",
     "publint": "0.3.17",
-    "tsdown": "0.18.2",
+    "tsdown": "0.20.3",
     "typescript": "5.9.3",
     "unplugin-vue": "7.1.1",
     "vite": "7.3.1",