Update changelog

Author: aeisenberg

extensions/ql-vscode/CHANGELOG.md

@@ -3,6 +3,7 @@
 ## [UNRELEASED]
 
 - Restart the CodeQL language server whenever the _CodeQL: Restart Query Server_ command is invoked. This avoids bugs where the CLI version changes to support new language features, but the language server is not updated. [#2238](https://github.com/github/vscode-codeql/pull/2238)
+- Avoid requiring a manual restart of the query server when the [external CLI config file](https://docs.github.com/en/code-security/codeql-cli/using-the-codeql-cli/specifying-command-options-in-a-codeql-configuration-file#using-a-codeql-configuration-file) changes. [#22892289)
 
 ## 1.8.1 - 23 March 2023