onnxruntime

684e900e - Remove NETSTANDARD1.1 moniker and NETSTD1.1 specific code (#16018)

Remove NETSTANDARD1.1 moniker and NETSTD1.1 specific code (#16018) ### Description Remove NETSTANDARD1.1 moniker and NETSTD1.1 specific code. We no longer target this platform. ### Motivation and Context NETSTANDARD1.1 target constraints the development and the modern libraries we would like to use in the code while it is apparently no longer required by customers.