Bump astro from 5.4.1 to 5.12.8 in /app/app (#17)

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Author: dependabot[bot]

app/app/package.json

@@ -28,7 +28,7 @@
     "@iconify-json/twemoji": "^1.2.2",
     "@iconify/tailwind4": "^1.0.6",
     "@tailwindcss/vite": "^4.0.9",
-    "astro": "^5.4.1",
+    "astro": "^5.12.8",
     "plotly.js": "^2.35.3",
     "tailwindcss": "^4.0.9",
     "typescript": "^5.8.2"