build(deps): bump astro from 5.15.5 to 5.15.6

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 5.15.5 to 5.15.6.
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/main/packages/astro/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/astro@5.15.6/packages/astro)

---
updated-dependencies:
- dependency-name: astro
  dependency-version: 5.15.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

package.json

@@ -34,7 +34,7 @@
 		"@playform/build": "0.2.5",
 		"@playform/compress": "0.2.0",
 		"@playform/inline": "0.1.2",
-		"astro": "5.15.5",
+		"astro": "5.15.6",
 		"deepmerge-ts": "7.1.5",
 		"dotenv": "17.2.3",
 		"typescript": "5.9.3",