VS Code: Release 1.2.1 (#2944)

Context:
https://sourcegraph.slack.com/archives/C05AGQYD528/p1706583104496449?thread_ts=1706568527.428369&cid=C05AGQYD528
& https://sourcegraph.slack.com/archives/C05AGQYD528/p1706561150132109

Patch release for 1.2.1 to include a temporary fix for the auth token
issue and clarification on removing slash commands.

## Test plan

<!-- Required. See
https://sourcegraph.com/docs/dev/background-information/testing_principles.
-->

Version bump for the 1.2.1 patch release.

- [x] Wait for @kalanchan to confirm that the fix works for him before
cutting the patch release:
https://sourcegraph.slack.com/archives/C05AGQYD528/p1706583739567489?thread_ts=1706568527.428369&cid=C05AGQYD528

vscode/CHANGELOG.md

@@ -8,6 +8,13 @@ This is a log of all notable changes to Cody for VS Code. [Unreleased] changes a
 
 ### Fixed
 
+### Changed
+
+## [1.2.1]
+
+### Fixed
+
+- Fixed an authentication issue that caused users to be unable to sign in. [pull/2943](https://github.com/sourcegraph/cody/pull/2943)
 - Chat: Updated Chat input tips as commands are no longer executable from chat. [pull/2934](https://github.com/sourcegraph/cody/pull/2934)
 - Custom Command: Removed codebase as context option from the custom command menu. [pull/2932](https://github.com/sourcegraph/cody/pull/2932)
 - Command: Add `/ask` back to the Cody command menu, which was removed by accident. [pull/2939](https://github.com/sourcegraph/cody/pull/2939)

vscode/package.json

@@ -2,7 +2,7 @@
   "name": "cody-ai",
   "private": true,
   "displayName": "Cody AI",
-  "version": "1.2.0",
+  "version": "1.2.1",
   "publisher": "sourcegraph",
   "license": "Apache-2.0",
   "icon": "resources/cody.png",