title: NuGet 6 not available on Azure Pipeline
body: <p>I try to update my pipeline from NET 5 to NET 6. It immediately bombed out at nuget restore saying that the used version does not support NET 6. When going to advanced settings for the NuGet tool installer therer is an i icon showing all available versions (links to <a href="https://dist.nuget.org/tools.json" rel="nofollow noreferrer">https://dist.nuget.org/tools.json</a>). That link shows 6.0.0-preview.3. If I set this and run the pipeline I get an error that latest version is 5.11.</p>
  <p>I did add a task BEFORE to install net SDK 6 which succeeds (Successfully installed .NET Core sdk version 6.0.100-preview.3.21202.5.
  Creating global tool path and pre-pending to PATH.)</p>
  <p>So why can't it find the nuget 6 ?</p>