Bump astro from 5.14.3 to 5.15.6

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 5.14.3 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.json

@@ -14,7 +14,7 @@
     "@astrojs/mdx": "4.2.1",
     "@astrojs/rss": "4.0.11",
     "@astrojs/sitemap": "3.3.0",
-    "astro": "5.14.3"
+    "astro": "5.15.6"
   },
   "devDependencies": {
     "@igor.dvlpr/astro-post-excerpt": "^3.0.4",