chore(deps): update devdependency tsdown to ^0.18.1 (#84)

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

Author: renovate[bot]

packages/example/package.json

@@ -21,7 +21,7 @@
     "@arethetypeswrong/cli": "^0.18.2",
     "@types/feedparser": "^2.2.8",
     "publint": "^0.3.16",
-    "tsdown": "^0.18.0",
+    "tsdown": "^0.18.1",
     "typescript": "^5.9.3"
   },
   "repository": {