Update library to target .NET 9 and .NET 10

[Copilot]

Shifts library target frameworks from .NET 8/9 to .NET 9/10.

Changes

• Target frameworks: net8.0-windows;net9.0-windows → net9.0-windows;net10.0-windows
• Package dependencies: Added conditional reference to Microsoft.Extensions.Hosting 10.0.0 for .NET 10 target
• Version: 1.2.0 → 1.3.0 (breaking change - drops .NET 8 support)

Note

.NET 10 preview SDKs are not yet available. The library will build against .NET 10 when the SDK releases. Consumers will need .NET 9+ to use this version.

Original prompt

Create a branch and update the library to farther net 9 and net 10

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