chore(deps): update dependency @astrojs/markdoc to ^0.15.0

Author: mend-for-github-com[bot]

toolbar-app/package.json

@@ -11,7 +11,7 @@
     "astro": "astro"
   },
   "dependencies": {
-    "@astrojs/markdoc": "^0.12.11",
+    "@astrojs/markdoc": "^0.15.0",
     "@astrojs/starlight": "^0.30.3",
     "@astrojs/starlight-markdoc": "^0.2.0",
     "adm-zip": "^0.5.16",