Update dotnet.yml (#16)

use dotnet nuget push

Author: patrik-j-nilsson

.github/workflows/dotnet.yml

@@ -38,5 +38,5 @@ jobs:
         run: dotnet test --no-build --verbosity normal --filter "TestCategory!=Integration"
       - name: Publish
         if: startsWith(github.ref, 'refs/heads/release')
-        run: nuget push **\*.nupkg -Source 'https://api.nuget.org/v3/index.json' -ApiKey ${{secrets.NUGET_API_KEY}}
+        run: dotnet nuget push **\*.nupkg -Source 'https://api.nuget.org/v3/index.json' -ApiKey ${{secrets.NUGET_API_KEY}}