Prepare changelog for release

Author: juliasilge

apps/vscode/CHANGELOG.md

@@ -1,6 +1,6 @@
 # Changelog
 
-## 1.122.0 (unreleased)
+## 1.122.0 (Release on 2025-05-26)
 
 - Language server temporary files are now permanently deleted, bypassing the trash can (<https://github.com/quarto-dev/quarto/pull/714>).
 - Change controls on Positron editor action bar and fix "Render on Save" behavior (<https://github.com/quarto-dev/quarto/pull/706>).