chore(deps): bump astro in the npm_and_yarn group across 1 directory

Bumps the npm_and_yarn group with 1 update in the / directory: [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro).


Updates `astro` from 5.15.7 to 5.15.9
- [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/[email protected]/packages/astro)

---
updated-dependencies:
- dependency-name: astro
  dependency-version: 5.15.9
  dependency-type: direct:production
  dependency-group: npm_and_yarn
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

docs/package.json

@@ -15,7 +15,7 @@
     "@astrojs/starlight-tailwind": "^4.0.1",
     "@openai/agents": "workspace:*",
     "@tailwindcss/vite": "^4.1.16",
-    "astro": "^5.15.7",
+    "astro": "^5.15.9",
     "sharp": "^0.34.4",
     "starlight-llms-txt": "^0.6.0",
     "starlight-typedoc": "^0.21.4",