chore(deps): update dependency tsdown to ^0.20.0

Author: renovate[bot]

package.json

@@ -70,7 +70,7 @@
     "@vitest/coverage-v8": "^3.2.2",
     "@vitest/ui": "^3.2.2",
     "cli-progress": "^3.12.0",
-    "tsdown": "^0.12.7",
+    "tsdown": "^0.20.0",
     "tsx": "^4.19.4",
     "typescript": "5.8.3",
     "vitest": "^3.2.2"