bump(shopify-ai-toolkit): 859be93b → a8e87a7c (#2388)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

.claude-plugin/marketplace.json

@@ -2496,7 +2496,7 @@
       "source": {
         "source": "url",
         "url": "https://github.com/Shopify/Shopify-AI-Toolkit.git",
-        "sha": "859be93bfc858f183ff5eb40183e35a4d91d2950"
+        "sha": "a8e87a7cff153479eb77230d9c232484a1f3062f"
       },
       "homepage": "https://shopify.dev"
     },