add missing changelog entry for pull/2627 (#2647)

Adds a missing changelog entry for
#2627

## Test plan

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Changelog update. All tests are passing.

vscode/CHANGELOG.md

@@ -18,6 +18,7 @@ This is a log of all notable changes to Cody for VS Code. [Unreleased] changes a
 - Fixed unresponsive stop button in chat when an error is presented. [pull/2588](https://github.com/sourcegraph/cody/pull/2588)
 - Added existing `cody.useContext` config to chat to control context fetching strategy. [pull/2616](https://github.com/sourcegraph/cody/pull/2616)
 - [Internal] Opening files with non-file schemed URLs no longer breaks Autocomplete when `.cody/ignore` is enabled. [pull/2640](https://github.com/sourcegraph/cody/pull/2640)
+- Fixed unresponsive dropdown menu for selecting chat model in Chat view. [pull/2627](https://github.com/sourcegraph/cody/pull/2627)
 
 ### Changed