CONFIG: Target Version

[BrianLParker]

This library now targets .Net 7.0. The issue with this is compatibility with older versions when pipeline building. Normally this is fine but in the case of SDK pipeline's the developer may want to target a LTS version currently 6.0.

The library has a dependency of YamlDotNet & Xeption

I would recommend after looking at the dependencies of these library's targeting "netstandard2.0;netstandard2.1"

This will allow the solution the library is consumed by to support any version compatible with netstandard2.0 & netstandard2.1

An example of the issue is in the current Standard.AI.OpenAI repository, we cannot target netstandard2.1 for integration with a wider range of clients, as the build pipeline fails if we are not targeting .Net 7.0 because of this restriction.