chore: bump tsdown from 0.17.2 to 0.18.3

Bumps [tsdown](https://github.com/rolldown/tsdown) from 0.17.2 to 0.18.3.
- [Release notes](https://github.com/rolldown/tsdown/releases)
- [Commits](rolldown/tsdown@v0.17.2...v0.18.3)

---
updated-dependencies:
- dependency-name: tsdown
  dependency-version: 0.18.3
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package.json

@@ -134,7 +134,7 @@
     "shx": "^0.4.0",
     "ts-node": "^10.9.2",
     "ts2mjs": "^4.0.0",
-    "tsdown": "^0.17.2",
+    "tsdown": "^0.18.3",
     "tslib": "^2.8.1",
     "tsup": "^8.5.1",
     "typescript": "~5.9.3",