build(deps): bump astro from 5.15.6 to 5.15.9 in /docs (#150)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

docs/package.json

@@ -12,7 +12,7 @@
   "dependencies": {
     "@astrojs/sitemap": "^3.6.0",
     "@astrojs/starlight": "^0.36.1",
-    "astro": "^5.15.6",
+    "astro": "^5.15.9",
     "astro-mermaid": "^1.1.0",
     "mermaid": "^11.12.1",
     "sharp": "^0.34.4",