chore(deps): update astro monorepo

Author: renovate[bot]

package.json

@@ -26,11 +26,11 @@
   },
   "devDependencies": {
     "@astrojs/check": "^0.9.8",
-    "@astrojs/markdown-remark": "^6.3.11",
-    "@astrojs/mdx": "^4.3.14",
+    "@astrojs/markdown-remark": "^7.0.0",
+    "@astrojs/mdx": "^5.0.0",
     "@astrojs/rss": "^4.0.17",
     "@astrojs/sitemap": "^3.7.1",
-    "@astrojs/svelte": "^7.2.5",
+    "@astrojs/svelte": "^8.0.0",
     "@catppuccin/catppuccin": "github:catppuccin/catppuccin#7e4506607b8a6c298ce0876e385c52281e879245",
     "@catppuccin/palette": "^1.8.0",
     "@iconify-json/ph": "^1.2.2",
@@ -42,7 +42,7 @@
     "@rollup/plugin-yaml": "^4.1.2",
     "@types/node": "^22.19.15",
     "@vitest/coverage-v8": "^3.2.4",
-    "astro": "^5.18.1",
+    "astro": "^6.0.0",
     "astro-expressive-code": "^0.41.7",
     "astro-icon": "1.1.5",
     "fuse.js": "^7.1.0",