Update Toolbox version to 1.18.11 (#164)

This pull request updates the `toolbox` package version in the
`config.json` file from `1.18.10` to `1.18.11`.

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Low risk version bump limited to `config.json`, with no code changes.
Any risk is confined to compatibility/behavior changes introduced by
`toolbox` 1.18.11 itself.
> 
> **Overview**
> Updates the `toolbox` version in `config.json` from `1.18.10` to
`1.18.11` for the production channel.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
b743268. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: volodymyr-memsql

config.json

@@ -5,5 +5,5 @@
   "kai": "1.0.102",
   "server": "9.1.1-626ec146c9",
   "studio": "4.1.1",
-  "toolbox": "1.18.10"
+  "toolbox": "1.18.11"
 }