chore(deps): update dependency tsdown to v0.21.7

Author: renovate[bot]

package.json

@@ -26,7 +26,7 @@
     "orval": "7.17.0",
     "prettier": "3.7.3",
     "ts-morph": "^27.0.2",
-    "tsdown": "0.16.8",
+    "tsdown": "0.21.7",
     "tslib": "2.8.1",
     "typescript": "5.9.3",
     "zod": "^4.1.13"