Link to .NET NuGet caching recommendations via setup-dotnet

[SeanKilleen]

Code of Conduct

• I have read and agree to the GitHub Docs project's Code of Conduct

What article on docs.github.com is affected?

https://docs.github.com/en/actions/using-workflows/caching-dependencies-to-speed-up-workflows

content/actions/using-workflows/caching-dependencies-to-speed-up-workflows.md

What part(s) of the article would you like to see updated?

Adding the existing references for .NET's NuGet manager via setup-dotnet, like the other libraries.

Additional information

No response

[nguyenalex836]

@SeanKilleen Thank you for opening an issue and linking it to your PR! ✨