fixed argument name

Author: Petr Sramek

.github/workflows/dotnet.yml

@@ -248,7 +248,7 @@ jobs:
           path: ${{ runner.temp }}/packages/
       - run: |
           dotnet nuget add source ${{ secrets.PRIVATE_NUGET_PACKAGE_FEED_URL }} --name private-feed
-          dotnet nuget push **/*.nupkg --source private-feed --ApiKey ${{ secrets.PRIVATE_NUGET_PACKAGE_FEED_API_KEY }}
+          dotnet nuget push **/*.nupkg --source private-feed --api-key ${{ secrets.PRIVATE_NUGET_PACKAGE_FEED_API_KEY }}
         working-directory: ${{ runner.temp }}/packages/
   
   release-package: