Merge pull request #3648 from hey-api/renovate/tsdown-0.x

chore(deps): update dependency tsdown to v0.21.4

Author: mrlubos

package.json

@@ -70,7 +70,7 @@
     "husky": "9.1.7",
     "lint-staged": "16.4.0",
     "oxfmt": "0.41.0",
-    "tsdown": "0.21.3",
+    "tsdown": "0.21.4",
     "tsx": "4.21.0",
     "turbo": "2.8.20",
     "typescript": "5.9.3",