Castle.Core 5.2.1

[304NotModified]

Testing 5.2.x

https://github.com/castleproject/Core/issues/662

See also remarks for NSubstitute at https://github.com/castleproject/Core/issues/684

[304NotModified]

It seems there are nullable changes in Caste Core we should handle here. See build errors.

Error: /home/runner/work/NSubstitute/NSubstitute/src/NSubstitute/Proxies/CastleDynamicProxy/ProxyIdInterceptor.cs(28,29): error CS8602: Dereference of a possibly null reference. [/home/runner/work/NSubstitute/NSubstitute/src/NSubstitute/NSubstitute.csproj::TargetFramework=net8.0]
Error: /home/runner/work/NSubstitute/NSubstitute/src/NSubstitute/Proxies/CastleDynamicProxy/CastleInvocationMapper.cs(12,13): error CS8602: Dereference of a possibly null reference. [/home/runner/work/NSubstitute/NSubstitute/src/NSubstitute/NSubstitute.csproj::TargetFramework=net8.0]
Error: /home/runner/work/NSubstitute/NSubstitute/src/NSubstitute/Proxies/CastleDynamicProxy/CastleInvocationMapper.cs(27,72): error CS8603: Possible null reference return. [/home/runner/work/NSubstitute/NSubstitute/src/NSubstitute/NSubstitute.csproj::TargetFramework=net8.0]
Error: /home/runner/work/NSubstitute/NSubstitute/src/NSubstitute/Proxies/CastleDynamicProxy/CastleDynamicProxyFactory.cs(128,26): error CS8604: Possible null reference argument for parameter 'target' in 'object ProxyGenerator.CreateInterfaceProxyWithTarget(Type interfaceToProxy, Type[]? additionalInterfacesToProxy, object target, ProxyGenerationOptions options, params IInterceptor[] interceptors)'. [/home/runner/work/NSubstitute/NSubstitute/src/NSubstitute/NSubstitute.csproj::TargetFramework=net8.0]