chore(vtex): bump @decocms/runtime to ^1.6.2 (#427)

Picks up the actual cache fix from decocms/studio#3300 — the 1.6.1
patch lookup-key was undefined under zod 4 so the cache wrapper
never installed. 1.6.2 hardcodes the MCP method name and should
finally drop warm tools/list latency from ~5s to ms-scale.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: viktormarinho

bun.lock

@@ -13,7 +13,7 @@
   },
   "dependencies": {
     "@decocms/bindings": "^1.4.0",
-    "@decocms/runtime": "^1.6.1",
+    "@decocms/runtime": "^1.6.2",
     "@modelcontextprotocol/sdk": "^1.27.1",
     "zod": "^4.0.0"
   },