Update changelog

Author: shati-patel

extensions/ql-vscode/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [UNRELEASED]
 
+- When downloading a database, we no longer add the database source folder to the workspace by default (since this caused bugs in single-folder workspaces). [#3047](https://github.com/github/vscode-codeql/pull/3047)
+  - You can manually add individual database source folders to the workspace with the "Add Database Source to Workspace" right-click command in the databases view.
+  - To restore the old behavior of adding all database source folders by default, set the `codeQL.databaseDownload.addDatabaseSourceToWorkspace` setting to `true`.
+
 ## 1.9.3 - 26 October 2023
 
 - Sorted result set filenames now include a hash of the result set name instead of the full name. [#2955](https://github.com/github/vscode-codeql/pull/2955)