fix(deps): update dependency starlight-blog to ^0.28.0

Author: renovate[bot]

docs/package.json

@@ -17,7 +17,7 @@
     "@astrojs/check": "^0.9.9",
     "@astrojs/starlight": "^0.41.3",
     "astro": "^7.1.1",
-    "starlight-blog": "^0.26.1",
+    "starlight-blog": "^0.28.0",
     "starlight-package-managers": "^0.12.0",
     "typescript": "^5.9.3"
   },