When pulling or cloning from a repo, go-git will update submodules if the option is set.

The problem is when calling (*Worktree).updateSubmodules. It doesn't take the context from a caller.

It creates new context internally.

This can lead to situations where we can't gracefully handle slow fetching of submodules or etc.

Is there any reason that it ignores context from caller?
If there isn't, I think we better pass context to the funciton.