Update template to use new version of Expecto

[sonicbhoc]

The version of Expecto the template installs is old enough that the function used to actually run tests has been changed, so the library does not compile if Expecto is updated. It also depends on .NET 6, when .NET 8 is the current LTS version.

I would request that versions of the dependencies and .NET itself are bumped.

[MNie]

Hi, @sonicbhoc happy to accept a PR with the above-mentioned bump.

[sonicbhoc]

If I can find the time, I will try. I actually have no idea how templates work if I'm honest. It would probably be good to learn.

[Numpsy]

There's another issue as it stands as well - the reference to YoloDev.Expecto.TestSdk 0.* currently pulls in version 0.14.3 which requires Expecto 10, so you get a version conflict between that and the direct reference to Expecto 9 in the template