Update build-windows.yml

.github/workflows/build-windows.yml

@@ -31,6 +31,11 @@ jobs:
         target: 'desktop'
         arch: 'win32_mingw73'
 
+    - name: Set up MinGW
+      uses: egor-tensin/setup-mingw@v2
+      with:
+        platform: x64
+
     - name: Configure CMake
       run: cmake -B ${{github.workspace}}\build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -DCMAKE_C_COMPILER=gcc -DCMAKE_CXX_COMPILER=g++