修正macos持续集成运行目录 (#2234)

修改 macos 最后一步运行目录release/linux/Debug/ 改为release/darwin/Debug/ 
参看build log  
https://github.com/ZLMediaKit/ZLMediaKit/actions/runs/4150150582/jobs/7179611556

.github/workflows/macos.yml

@@ -34,6 +34,6 @@ jobs:
       run: mkdir -p build && cd build && cmake .. &&  make -j $(nproc)
 
     - name: 运行MediaServer
-      run: pwd && cd release/linux/Debug && sudo ./MediaServer -d &
+      run: pwd && cd release/darwin/Debug && sudo ./MediaServer -d &