fix(deps): update dependency astro to v6

Author: renovate[bot]

docs/package.json

@@ -15,7 +15,7 @@
     "@astrojs/starlight": "^0.37.1",
     "@hideoo/starlight-plugins-docs-components": "^0.4.1",
     "@openscript-ch/starlight-theme": "workspace:*",
-    "astro": "^5.16.5",
+    "astro": "^6.0.0",
     "sharp": "^0.34.5"
   },
   "engines": {

package.json

@@ -22,7 +22,7 @@
     "@hideoo/prettier-config": "^2.0.1",
     "@hideoo/tsconfig": "^2.0.3",
     "@types/node": "^25.0.2",
-    "astro": "^5.16.5",
+    "astro": "^6.0.0",
     "eslint": "^9.39.2",
     "prettier": "^3.7.4",
     "prettier-plugin-astro": "^0.14.1",