Bump astro from 4.15.9 to 4.15.11

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 4.15.9 to 4.15.11.
- [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@4.15.11/packages/astro)

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

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

package.json

@@ -17,7 +17,7 @@
 		"@astrojs/sitemap": "3.2.0",
 		"@tammergard/prettier-config": "2.1.0",
 		"@tammergard/tsconfig": "2.8.0",
-		"astro": "4.15.9",
+		"astro": "4.15.11",
 		"preact": "10.24.2",
 		"prettier": "3.3.3",
 		"react": "18.3.1",