fix CI with exclude

Author: pifopi

.github/workflows/cpp-ci-serial-programs.yml

@@ -10,30 +10,16 @@ jobs:
       fail-fast: false
       matrix:
         os: [windows-2025, macos-13, ubuntu-24.04]
+        toolset: ['', '-T ClangCL']
         qt_version: ['6.9.0']
         include:
           - qt_version: '6.9.0'
             qt_version_major: '6'
             qt_modules: 'qtmultimedia qtserialport'
-
-          - os: 'windows-2025'
-            toolset: ''
-
-          - os: 'windows-2025'
-            toolset: '-T ClangCL'
-
+        exclude:
           - os: 'macos-13'
-            toolset: ''
-
-          # - os: 'macos-13'
-          #   toolset: '-T ClangCL'
-          # default toolset on mac is already clang
-
-          - os: 'ubuntu-24.04'
-            toolset: ''
-
-          - os: 'ubuntu-24.04'
             toolset: '-T ClangCL'
+            # Excluded because macos default toolset is already clang
 
     steps:
     - uses: actions/checkout@v4