fix(deps): update dependency @astrojs/starlight to v0.26.3

Author: renovate[bot]

bun.lockb

@@ -18,7 +18,7 @@
     "plop": "plop"
   },
   "dependencies": {
-    "@astrojs/starlight": "0.26.2",
+    "@astrojs/starlight": "0.26.3",
     "astro": "4.15.2",
     "sharp": "0.33.5"
   },