Remove API key from NuGet push command

Removed API key from NuGet push command for security.

Author: asklar

.github/workflows/publish-dotnet.yml

@@ -69,4 +69,4 @@ jobs:
       - name: Publish to NuGet
         run: |
           cd dotnet/mcpb
-          dotnet nuget push ./artifacts/*.nupkg --api-key oy2p --source https://api.nuget.org/v3/index.json --skip-duplicate
+          dotnet nuget push ./artifacts/*.nupkg --source https://api.nuget.org/v3/index.json --skip-duplicate