Update Auth0 Templates reference in Available-templates-for-dotnet-new.md

[andychiare]

Problem

The current reference to the Auth0 Templates points to a specific NuGet package version, which is obsolete.

Solution

Point to the latest NuGet package version

[andychiare]

Any update on this? 🤔

[MiYanni]

/azp run

[azure-pipelines[bot]]

Azure Pipelines successfully started running 1 pipeline(s).

[MiYanni]

@andychiare Looking at the history, you were the one that suggested adding the ::2.0.0 specifier. Was there was reason for this?

[andychiare]

The reason was my inexperience with NuGet packages :-)