Fix .NET framework version detection #4603
Description
Currently fails with 10.0.0, which is 4 chars.
https://github.com/cake-build/cake/blob/55fab48e211fb1299a6107bc7844d6da6d12d492/src/Cake.Core/Polyfill/EnvironmentHelper.cs#L145C13-L145C101
var netCoreAppVersion = string.Concat(assemblyPath.Skip(runtimeBasePathLength).Take(3));