Revert "remove unnecessary changes"

This reverts commit 47594b7.

Author: g-abilio

.github/workflows/cmake_build.yml

@@ -30,9 +30,9 @@ jobs:
           - toolchain: linux-gcc
             os: ubuntu-22.04
             compiler: gcc
-            qt_version: "5.15.2"
+            qt_version: "6.3.0"
             modules: ""
-            use_qt6: "OFF"
+            use_qt6: "ON"
 
           - toolchain: macos-clang
             os: macos-latest