Update building-and-testing-net.md

[mark-mxwl]

Why:

Closes: #32098

What's being changed (if available, include any code snippets, screenshots, or gifs):

Revised the workflow example to include the updated syntax for setup-dotnet NuGet dependency caching (v3.2.0). As the action uses @toolkit/cache under the hood, there's no need to configure @actions/cache separately. The article has been revised to reflect changes made to the workflow example.

Note: I do wonder if it's necessary to include an installation step in the workflow, as dependency installation is covered the previous section. Thoughts?

Reference material:
Caching NuGet Packages
setup-dotnet v3.2.0

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[nguyenalex836]

@mark-mxwl Thanks so much for opening a PR! I'll get this triaged for review ✨

[na1307]

The changes do not mention NuGet lock files. That workflow doesn't work out of the box because generating a NuGet lock file requires modifying the project file.

[SiaraMist]

Hey @mark-mxwl, thank you so much for updating this example! 💛

Note: I do wonder if it's necessary to include an installation step in the workflow, as dependency installation is covered the previous section. Thoughts?

I do like having that extra context in the example to show what a more complete workflow would look like, so I'm inclined to leave the installation step. Also, I think since it only takes up two lines, it's not too much mental overhead for readers. 👍

Thank you again for making these updates, I'm going to get this merged!

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