fix(deps): update dependency astro to v5.3.0 (#350)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -17,7 +17,7 @@
     "@astrojs/check": "0.9.4",
     "@astrojs/cloudflare": "12.2.1",
     "@astrojs/starlight": "0.31.1",
-    "astro": "5.2.6",
+    "astro": "5.3.0",
     "semver": "7.7.1",
     "sharp": "0.33.5",
     "starlight-package-managers": "0.10.0",