Update dotnet-core-desktop.yml

Author: LiorBanai

.github/workflows/dotnet-core-desktop.yml

@@ -30,7 +30,7 @@ jobs:
     - name: Install .NET Core
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 3.1.101
+        dotnet-version: 5.0.202
 
     # Add  MSBuild to the PATH: https://github.com/microsoft/setup-msbuild
     - name: Setup MSBuild.exe