build(deps-dev): bump tsdown from 0.19.0 to 0.20.1 (#1173)

Author: dependabot[bot]

package.json

@@ -81,7 +81,7 @@
     "axios": "1.13.2",
     "c8": "10.1.3",
     "jsdom": "27.4.0",
-    "tsdown": "0.19.0",
+    "tsdown": "0.20.1",
     "tslib": "2.8.1",
     "typescript": "5.9.3",
     "vite-bundle-analyzer": "^1.3.2",