chore: add 4.9.1 to changelog

Author: jsjoeio

CHANGELOG.md

@@ -20,6 +20,20 @@ Code v99.99.999
 
 -->
 
+## [4.9.1](https://github.com/coder/code-server/releases/tag/v4.9.1) - 2022-12-15
+
+Code v1.73.1
+
+### Changed
+
+- Updated a couple steps in the build and release process to ensure we're using
+  `npm` and `yarn` consistently depending on the step.
+
+### Fixed
+
+- Fixed an issue with code-server version not displaying in the Help > About window.
+- Fixed terminal not loading on macOS clients.
+
 ## [4.9.0](https://github.com/coder/code-server/releases/tag/v4.9.0) - 2022-12-06
 
 Code v1.73.1