fix: Remove duplicate URL entry in answers.json

The `url` key was duplicated in the "Resolving rate limit issues caused by model switching" entry, causing an error. This commit removes the duplicate entry.

Author: jdorfman

answers.json

@@ -26,7 +26,6 @@
 {
   "url": "https://community.sourcegraph.com/t/hitting-limits-due-to-model-switching/2200",
   "title": "Resolving rate limit issues caused by model switching",
-  "url": "https://community.sourcegraph.com/t/error-403-workspaces-forbidden-user-is-banned/2438",
   "answer": "If you encounter rate limit issues due to frequent model switching, update your Cody plugin/extension to the latest stable version. Then, log out and log back into your Sourcegraph account to resolve the issue. This solution addresses problems related to what Sourcegraph identified as 'problematic code' that caused some users to be incorrectly flagged or banned."
 },
 {