chore(deps): update dependency tsdown to v0.21.6 (#173)

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

Author: renovate[bot]

pnpm-workspace.yaml

@@ -11,7 +11,7 @@ catalog:
   '@oxc-node/core': 0.0.35
   '@tailwindcss/vite': 4.2.2
   '@types/node': 24.1.0
-  tsdown: 0.21.5
+  tsdown: 0.21.6
   typescript: 5.9.3
   vitest: 4.1.0
   oxfmt: 0.42.0