尝试修复构建失败

Author: lindexi

.github/workflows/MediaConverters.yml

@@ -22,7 +22,12 @@ jobs:
 
     steps:
     - uses: actions/checkout@v1
-  
+    - name: Setup dotnet
+      uses: actions/setup-dotnet@v4
+      with:
+        dotnet-version: | 
+          9.0.x
+
     - name: Build with dotnet
       run: dotnet build --configuration Release src/MediaConverters/MediaConverters.sln