iwyu.yml: fixed missing Cups dependency for Qt6PrintSupport in CMake …

…[skip ci] (#6867)

.github/workflows/iwyu.yml

@@ -61,6 +61,7 @@ jobs:
           dnf install -y cmake clang pcre-devel
           dnf install -y libglvnd-devel  # fixes missing dependency for Qt in CMake
           dnf install -y p7zip-plugins  # required as fallback for py7zr in Qt installation
+          dnf install -y cups-devel  # required for Qt6PrintSupport in CMake since Qt 6.7.3
           dnf install -y iwyu
           ln -s iwyu_tool.py /usr/bin/iwyu_tool
 
@@ -141,6 +142,7 @@ jobs:
         run: |
           sudo apt-get update
           sudo apt-get install -y cmake make libpcre3-dev
+          sudo apt-get install -y libcups2-dev  # required for Qt6PrintSupport in CMake since Qt 6.7.3
           sudo apt-get install -y libgl-dev  # missing dependency for using Qt in CMake
 
       - name: Install clang