eclipse-cdt 10.5.0 has not been released yet, fix its changelog so that the autopublish can work (fixes #1030)

Author: nedtwigg

_ext/eclipse-cdt/CHANGES.md

@@ -3,8 +3,6 @@
 We adhere to the [keepachangelog](https://keepachangelog.com/en/1.0.0/) format (starting after version `9.9.0`).
 
 ## [Unreleased]
-
-## [10.5.0] - 2021-12-10
 ### Added
 * Switch to Eclipse CDT release 10.5 for Eclipse 2021-12.