Update version number for 5.18.90

GIT_SILENT

CMakeLists.txt

 cmake_minimum_required(VERSION 3.0)
 
 project(ksysguard)
-set(PROJECT_VERSION "5.18.80")
+set(PROJECT_VERSION "5.18.90")
 
 set(KSYSGUARD_VERSION 4.98.0)
 set(KSYSGUARD_STRING_VERSION "${KSYSGUARD_VERSION}")