chore(deps): update dependency tsdown to v0.21.1 (main) (renovatebot#41946)

chore(deps): update dependency tsdown to v0.21.1

| datasource | package | from   | to     |
| ---------- | ------- | ------ | ------ |
| npm        | tsdown  | 0.21.0 | 0.21.1 |

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -352,7 +352,7 @@
     "semantic-release": "25.0.3",
     "tar": "7.5.11",
     "tmp-promise": "3.0.3",
-    "tsdown": "0.21.0",
+    "tsdown": "0.21.1",
     "type-fest": "5.4.4",
     "typescript": "5.9.3",
     "typescript-eslint": "8.56.1",