chore(deps): bump astro in the npm_and_yarn group across 1 directory (#656)

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": "^5.15.1",
+    "astro": "^5.15.6",
     "sharp": "^0.34.4",
     "starlight-llms-txt": "^0.6.0",
     "starlight-typedoc": "^0.21.4",