fix(deps): update dependency astro to v5.12.8 [security]

Author: renovate[bot]

packages/documentation/package.json

@@ -12,7 +12,7 @@
     "@astrojs/markdown-remark": "^6.3.2",
     "@astrojs/starlight": "^0.34.4",
     "@interledger/docs-design-system": "^0.8.0",
-    "astro": "5.11.0",
+    "astro": "5.12.8",
     "mermaid": "^11.8.1",
     "rehype-autolink-headings": "^7.1.0",
     "rehype-mathjax": "^7.1.0",