update

.github/workflows/macos.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [macos-10.15,macos-11.0]
+        os: [macos-11.0]
         qt_ver: [6.4.3]
         qt_arch: [clang_64]
     env:
@@ -34,6 +34,8 @@ jobs:
         with:
           version: ${{ matrix.qt_ver }}
           modules: 'qtmultimedia qt5compat qtshadertools'
+          aqtversion: '==2.1.*'
+          arch: ${{ matrix.qt_arch }}
           cached: 'false'
       - uses: actions/checkout@v2
         with: