chore(deps-dev): bump tsdown from 0.11.13 to 0.21.4 in /packages/admin

Bumps [tsdown](https://github.com/rolldown/tsdown) from 0.11.13 to 0.21.4.
- [Release notes](https://github.com/rolldown/tsdown/releases)
- [Commits](rolldown/tsdown@v0.11.13...v0.21.4)

---
updated-dependencies:
- dependency-name: tsdown
  dependency-version: 0.21.4
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

packages/admin/package.json

@@ -51,7 +51,7 @@
   },
   "homepage": "https://github.com/replane-dev/replane-javascript#readme",
   "devDependencies": {
-    "tsdown": "^0.11.9",
+    "tsdown": "^0.21.4",
     "typescript": "^5.4.0",
     "vitest": "^3.2.4"
   },