Typing issue

[eMaerthin]

Hi,
I can see that there is a little inconsistency on typing of the expires_delta argument in create_access_token. In utils it is Optional[datetime.timedelta] while as per jwt_manager and as mentioned in docstrings its type should be rather Optional[ExpiresDelta].

I can prepare a quick fix if you like.

[vimalloc]

That would be great, thanks!