dotnet 10 update

[talksinmath]

This is an update for dotnet 10.
I fixed a couple of deprecation warnings, all else is as is was (fine and very much in working in order!).

I did not change the version number to 4, I'd leave that up to you.

Thanks for the great project.

[Copilot]

Pull request overview

This pull request attempts to update the project from .NET 8.0 to .NET 10.0 and addresses deprecation warnings in the codebase. However, there is a critical issue: .NET 10.0 does not exist as of January 2026 (the latest stable version is .NET 9.0).

• Updated target framework from net8.0 to net10.0 in both project files
• Replaced deprecated IHostingEnvironment with IWebHostEnvironment in Startup.cs
• Updated IHeaderDictionary.Add() to use Append() method to resolve deprecation warning

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
NEasyAuthMiddleware/NEasyAuthMiddleware.csproj	Updated target framework to net10.0 (non-existent version)
NEasyAuthMiddleware.Sample/NEasyAuthMiddleware.Sample.csproj	Updated target framework to net10.0 (non-existent version)
NEasyAuthMiddleware.Sample/Startup.cs	Replaced deprecated IHostingEnvironment with IWebHostEnvironment and updated using statements
NEasyAuthMiddleware.Sample/CustomHeaderDictionaryTransformer.cs	Replaced deprecated Add() with Append() method, removed unused using statements, and fixed formatting

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