Update FSharp.Compiler.Service and FSharp.Core to the '9' versions

[Numpsy]

refs #221

Note: I'm trying to learn a bit more about how this stuff works, so I'm not certain how the new null AST bits like SynType.WithNull should be handled

[nojaf]

so I'm not certain how the new null AST bits like SynType.WithNull should be handled

That bit looked fine to me.

[TheAngryByrd]

Thanks for this! Also pushed up changes that make it net8/9. Also gonna mark this as blocked until we release the proj-info package.

The ProjInfo package is released and has been updated here

[baronfel]

Green! Thank you @Numpsy and @nojaf :) Will push out a new release shortly with this.