Upgrade from .NET 8 to .NET 10

[GennrichJ]

.NET 8 reaches end of support in November 2026. .NET 10 is the current LTS release.

Changes

• global.json: SDK 8.0.413 → 10.0.300
• Directory.Build.props: TargetFramework net8.0 → net10.0

All tests pass (123 passed, 1 skipped Unix-only test).

[AnderssonPeter]

@GennrichJ @xt0rted Any news on this, we currently have to install 2 versions of .net in our pipelines.
One idea here might be to multi target .net 8, 9, 10 and 11 to not lock the user into a specific .net version?

[AnderssonPeter]

Replacing <TargetFramework>net8.0</TargetFramework> with <TargetFrameworks>net8.0;net9.0;net10.0</TargetFrameworks> or <TargetFrameworks>net8.0;net9.0;net10.0;net11.0</TargetFrameworks> in Directory.Build.props should do the tick!

[GennrichJ]

.NET 9 also goes out of support in 4 months, at the same time as .NET 8. That's why I skipped it in favor of the next LTS release (.NET 10), which is supported through November 2028.

Ref: https://dotnet.microsoft.com/en-us/platform/support/policy/dotnet-core

That said, an additive approach (from 8 to 8, 9, 10) would still enable using a supported version after November without breaking those who haven't upgraded yet, which seems reasonable to me. Happy to adjust the PR if that's the direction @xt0rted would prefer to take.