Bump tsdown from 0.20.0-beta.3 to 0.20.3

Bumps [tsdown](https://github.com/rolldown/tsdown) from 0.20.0-beta.3 to 0.20.3.
- [Release notes](https://github.com/rolldown/tsdown/releases)
- [Commits](rolldown/tsdown@v0.20.0-beta.3...v0.20.3)

---
updated-dependencies:
- dependency-name: tsdown
  dependency-version: 0.20.3
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

packages/astro-og/package.json

@@ -40,7 +40,7 @@
 		"@typescript/native-preview": "7.0.0-dev.20260115.1",
 		"astro": "5.16.9",
 		"publint": "0.3.17",
-		"tsdown": "0.20.0-beta.3"
+		"tsdown": "0.20.3"
 	},
 	"peerDependencies": {
 		"astro": ">=5.0.0"