Add changenote for deprecating codeQL.runningQueries.saveCache

Author: nickrolfe

extensions/ql-vscode/CHANGELOG.md

@@ -3,6 +3,7 @@
 ## [UNRELEASED]
 
 - Rename command "CodeQL: Trim Overlay Base Cache" to "CodeQL: Trim Cache to Overlay-Base" for consistency with "CodeQL: Warm Overlay-Base Cache for [...]" commands. [#4204](https://github.com/github/vscode-codeql/pull/4204)
+- Deprecate the setting (`codeQL.runningQueries.saveCache`) to aggressively save intermediate results to the disk cache. [#4210](https://github.com/github/vscode-codeql/pull/4210)
 
 ## 1.17.6 - 24 October 2025