Pull request to upgrade to .Net8

[culeadragos]

Hi, Robert!

I upgraded locally the project to .Net 8. May I push the code to a new branch? Here is the message I get:

`"C:\Program Files\Git\bin\git.exe" push --recurse-submodules=check --progress "origin" refs/heads/master:refs/heads/upgradeToNet8 info: please complete authentication in your browser... remote: Permission to rpetz/SharpNetSH.git denied to culeadragos. fatal: unable to access 'https://github.com/rpetz/SharpNetSH.git/': The requested URL returned error: 403 Done

Press Enter or Esc to exit...`

Thank you!

culeadragos