ci(clang): use clang on mac

Author: Souvenal

.github/workflows/ci.yaml

@@ -26,7 +26,7 @@ jobs:
         version: '5.15.2'
         host: ${{ matrix.os == 'windows-latest' && 'windows' || matrix.os == 'macOS-latest' && 'mac' || 'linux' }}
         target: 'desktop'
-        arch: ${{ matrix.os == 'windows-latest' && 'win64_msvc2019_64' || 'gcc_64' }}
+        arch: ${{ matrix.os == 'windows-latest' && 'win64_msvc2019_64' || matrix.os == 'macOS-latest' && 'clang_64' || 'gcc_64' }}
         modules: 'qtbase'
         install-deps: 'true'