[ANN] NSubstitute 5.0.0 released

[David Tchepak]

Hi all,

We've released NSubstitute v5.0.0. This release updates our target frameworks to the ones [recommended by Microsoft](https://learn.microsoft.com/en-us/dotnet/core/compatibility/core-libraries/6.0/older-framework-versions-dropped): .NET 6+, .NET Framework 4.6.2+, .NET Standard 2.0+. Thanks to @Romfos for this change (#710), and @alexandrnikitin for review and merge. Thanks also to @TillW for some clarifications to our docs on internal members (#706).

See full release notes here: https://github.com/nsubstitute/NSubstitute/releases/tag/v5.0.0

Thanks a lot to all code contributors, reviewers, and people who have raised and/or commented on issues.

If you haven't already done so, please make sure you add the NSubstitute.Analyzers package wherever you reference NSubstitute: https://nsubstitute.github.io/help/nsubstitute-analysers/

As always, please raise an [issue on GitHub](https://github.com/nsubstitute/NSubstitute/issues) if you have any problems.

Changelog: https://github.com/nsubstitute/NSubstitute/blob/v5.0.0/CHANGELOG.md
Breaking changes:
* Dropped support for older platforms. Minimum versions now .NET 6+, .NET Framework 4.6.2+, .NET Standard 2.0+

Project links:
* NuGet:
    - https://www.nuget.org/packages/NSubstitute
    - https://www.nuget.org/profiles/NSubstitute
* GitHub: http://github.com/nsubstitute/NSubstitute
* Web: http://nsubstitute.github.io/