chore(deps): update astro monorepo

Author: renovate[bot]

package.json

@@ -18,13 +18,13 @@
   "devDependencies": {
     "@astrojs/check": "^0.9.4",
     "@astrojs/markdown-remark": "^6.0.1",
-    "@astrojs/mdx": "^3.1.9",
+    "@astrojs/mdx": "^4.0.0",
     "@astrojs/sitemap": "^3.2.1",
     "@astrolib/seo": "1.0.0-beta.8",
     "@vitest/coverage-v8": "3.1.1",
     "any-ascii": "^0.3.2",
     "arg": "^5.0.2",
-    "astro": "^4.16.18",
+    "astro": "^5.0.0",
     "astro-i18n-aut": "^0.7.0",
     "astro-icon": "^1.1.4",
     "commander": "^13.0.0",
@@ -53,7 +53,7 @@
       "undici@<5.29.0": "^5.29.0",
       "brace-expansion@>=2.0.0 <=2.0.1": "^2.0.2",
       "form-data@>=4.0.0 <4.0.4": "^4.0.4",
-      "astro@<=4.16.18": "^4.16.19",
+      "astro@<=4.16.18": "^5.0.0",
       "devalue@<5.3.2": "^5.3.2",
       "mermaid@>=11.0.0-alpha.1 <11.10.0": "^11.10.0",
       "axios@<1.12.0": "^1.12.0",