chore!: update dotnet 10

[Soap-141]

GitHub Issue: #

Proposed Changes

• Bug fix
• Feature
• Code style update (formatting)
• Refactoring (no functional changes, no api changes)
• Build or CI related changes
• Documentation content changes
• Other, please describe:

What is the current behavior?

Targets .NET 8.
Targets Uno 5.

What is the new behavior?

Targets .NET 10.
Targets Uno 6.
Removed support for Mac OS.

Impact on version

• Major (Public API was modified.)
  • Public constructs (class, struct, delegate, enum, etc.) were removed or renamed.
  • Public members were removed or renamed.
  • Public method signatures were changed or renamed.
• Minor (Public API was extended.)
  • Public constructs, members, or overloads were added.
• Patch (Public API was unchanged.)
  • A bug in behavior was fixed.
  • Documentation was changed.
• None (The library is unchanged.)
  • Only code under the build folder was changed.
  • Only code under the .github folder was changed.

Checklist

Please check that your PR fulfills the following requirements:

• Documentation has been added/updated.
• Automated Unit / Integration tests for the changes have been added/updated.
• Updated BREAKING_CHANGES.md (if you introduced a breaking change).
• Your conventional commit are aligned with the Impact on version section.

Other information

[Copilot]

Pull request overview

This PR updates the BackButtonManager project from .NET 8 to .NET 10, including all dependencies, build tools, and language versions. This is a major breaking change as indicated in the metadata.

Key changes:

• Updates all target frameworks from net8.0 to net10.0 and mobile/Windows variants
• Updates C# LangVersion from 12.0 to 14.0
• Updates all package dependencies to versions compatible with .NET 10, including Microsoft.Extensions, testing frameworks, and Uno.WinUI

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/BackButtonManager/BackButtonManager.csproj	Updates LangVersion to 14.0 and dependency packages (Microsoft.Extensions.Logging.Abstractions, Microsoft.SourceLink.GitHub)
src/BackButtonManager.Uno.WinUI/BackButtonManager.Uno.WinUI.csproj	Updates target frameworks to net10.0, changes SDK from MSBuild.Sdk.Extras to Microsoft.NET.Sdk, updates Windows SDK target, and updates Uno.WinUI and other dependencies
src/BackButtonManager.Uno.WinUI/winappsdk-workaround.targets	Updates Windows SDK version reference in comment from 19041 to 20348
src/BackButtonManager.Tests/BackButtonManager.Tests.csproj	Updates target framework to net10.0, LangVersion to 14.0, and all testing dependencies (coverlet, xunit, Moq, FluentAssertions, Microsoft.NET.Test.Sdk)
src/BackButtonManager.Abstractions/BackButtonManager.Abstractions.csproj	Updates LangVersion to 14.0 and dependency packages
build/stage-build.yml	Updates .NET SDK version to 10.0.100 and UnoCheck version and manifest
build/azure-pipelines.yml	Updates Windows hosted agent image from windows-2022 to windows-2025
BREAKING_CHANGES.md	Documents the .NET 8 to 10 update as version 4.0.0

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[Soap-141]

I have an issue with the Mac OS workload; I think I will remove it.