GHA CI: work around error when installing Qt

This is to (temporarily) work around CI errors at jurplel/install-qt-action.
Upstream issue: https://github.com/jurplel/install-qt-action/issues/130

.github/workflows/ci_macos.yaml

@@ -53,6 +53,7 @@ jobs:
       - name: Install Qt
         uses: jurplel/install-qt-action@v2
         with:
+          setup-python: false
           version: ${{ matrix.qt_version }}
 
       - name: Install libtorrent