Document what's new in ASP.NET Core for .NET 9 Preview 6

[danroth27]

Description

Update the "What's new in ASP.NET Core 9.0" for .NET 9 Preview 6

Page URL

https://learn.microsoft.com/en-us/aspnet/core/release-notes/aspnetcore-9.0?view=aspnetcore-8.0

Content source URL

https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/release-notes/aspnetcore-9.0.md

Document ID

4e75ad25-2c3f-b28e-6a91-ac79a9c683b6

Article author

@Rick-Anderson

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Associated WorkItem - 273723

[mkArtakMSFT]

@javiercn please add content for the features that you've implemented in preview6 (fingerprinting).

Also the new RenderMode API changes.

[mkArtakMSFT]

@halter73 please add content for the AllowAnonymous change that you've done.