Improvements to bash-it update

[NoahGorny]

We need to improve bash-it version to add an option to update to the latest patch, minor or major. This will allow users to have more control about the stability they want

Originally posted by @NoahGorny in #1744 (comment)

We also have no way to currently test this command, as it assumes it runs from a git repo, we need to fix this

[tbhaxor]

@NoahGorny For end users you should not use the git. Try update commands to fetch / check updates from the releases

[tbhaxor]

If you give me a headstart I will create a PR for it

[NoahGorny]

As I already said, this is a pretty difficult to do, but you are welcome to try and create a release workflow that we can use instead of cloning the repo