chore(deps): update dependency tsdown to ^0.15.6 (#804)

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

Author: renovate[bot]

package.json

@@ -136,7 +136,7 @@
     "simple-git-hooks": "^2.13.1",
     "svelte": "^5.39.6",
     "svelte-eslint-parser": "^1.3.3",
-    "tsdown": "^0.15.5",
+    "tsdown": "^0.15.6",
     "typescript": "^5.9.2",
     "unplugin-unused": "^0.5.3"
   },