Update CHANGELOG.md

Co-authored-by: Henry Mercer <[email protected]>

Author: shaikhul

CHANGELOG.md

@@ -2,10 +2,6 @@
 
 ## [UNRELEASED]
 
-No user facing changes.
-
-## 2.3.4 - 10 May 2023
-
 - Remove the requirement for `on.push` and `on.pull_request` to trigger on the same branches. [#1675](https://github.com/github/codeql-action/pull/1675)
 
 ## 2.3.3 - 04 May 2023