chore(deps): update dependency tsdown to ^0.15.12

Author: renovate[bot]

package.json

@@ -35,7 +35,7 @@
     "eslint-plugin-import-x": "^4.16.1",
     "jsdom": "^27.0.0",
     "prettier": "3.6.2",
-    "tsdown": "^0.15.6",
+    "tsdown": "^0.15.12",
     "tslib": "^2.8.1",
     "typescript": "~5.9.3",
     "typescript-eslint": "^8.45.0",