Update mac-os.yml

Author: edo9300

.github/workflows/mac-os.yml

@@ -24,7 +24,7 @@ jobs:
         cache: true
     - name: Qmake build
       env:
-        QMAKE_archs: {{ matrix.qmake-archs }}
+        QMAKE_FLAGS: ${{ matrix.qmake-archs }}
       run: |
         export PATH=$QT_ROOT_DIR/bin/:$PATH
         mkdir build && cd build