chore(CI): switch back to Qt 6.9.3 and add cache for install-qt-action

.github/workflows/macos.yml

@@ -12,8 +12,9 @@ jobs:
     - name: Install Qt
       uses: jurplel/install-qt-action@v4
       with:
-        version: '6.10.0'
+        version: '6.9.3'
         modules: 'qtimageformats'
+        cache: true
     - name: Install Conan and Dependencies
       id: conan
       working-directory: ./