Bump tsdown from 0.16.5 to 0.16.6

Bumps [tsdown](https://github.com/rolldown/tsdown) from 0.16.5 to 0.16.6.
- [Release notes](https://github.com/rolldown/tsdown/releases)
- [Commits](rolldown/tsdown@v0.16.5...v0.16.6)

---
updated-dependencies:
- dependency-name: tsdown
  dependency-version: 0.16.6
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

package.json

@@ -4,7 +4,7 @@
         "@apst/biome": "~0.3.0",
         "@apst/tsconfig": "~0.1.3",
         "@biomejs/biome": "^2.3.6",
-        "tsdown": "~0.16.5",
+        "tsdown": "~0.16.6",
         "typedoc": "~0.28.14",
         "typedoc-plugin-markdown": "^4.9.0",
         "typescript": "^5.9.3"