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
...

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

Author: dependabot[bot]

package-lock.json

@@ -23,7 +23,7 @@
     "@radix-ui/react-dialog": "^1.1.15",
     "@radix-ui/react-navigation-menu": "^1.2.14",
     "@radix-ui/react-popover": "^1.1.15",
-    "astro": "^5.13.2",
+    "astro": "^5.15.6",
     "clsx": "^2.1.1",
     "gray-matter": "^4.0.3",
     "html-to-text": "^9.0.5",