Upgraded to CDT version 2021-09 / 10.4.

Author: fvgh

Diff for: _ext/eclipse-cdt/CHANGES.md

@@ -3,6 +3,8 @@
 We adhere to the [keepachangelog](https://keepachangelog.com/en/1.0.0/) format (starting after version `9.9.0`).
 
 ## [Unreleased]
+### Added
+* Switch to Eclipse CDT release 10.4 for Eclipse 4.21.
 
 ## [10.3.0] - 2021-06-27
 ### Added

Diff for: _ext/eclipse-cdt/gradle.properties

@@ -5,7 +5,7 @@ description=Eclipse's CDT C/C++ formatter bundled for Spotless
 VER_JAVA=11
 
 # Compile dependencies
-VER_ECLIPSE_CDT=10.3
+VER_ECLIPSE_CDT=10.4
 VER_SPOTLESS_ECLISPE_BASE=[3.5.0,4.0.0[
 VER_ECLISPE_JFACE=[3.18.0,4.0.0[
 VER_ECLISPE_EFS=[3.7.0,4.0.0[