Upgrade singleuser.py for JupyterHub 3

[mahendrapaipuri]

The _api_request method of HubAuth in JupyterHub 3 is made into a coroutine. So, batchspawner-singleuser in its current implementation will fail to communicate with JupyterHub as request is never awaited.

This PR modifies the singleuser.py function to make it work for JupyterHub 2 and 3.

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[loikki]

Thanks, it solved my issue.

[mahendrapaipuri]

In fact, this PR is more elegant solution than what I proposed here. I havent seen it before submitting this PR.

@ryanlovett I think we need to merge #247 into main and make a new release as JupyterHub 3.0.0 has been already around for few months.

[gridley]

Awesome!! I was wrestling to get jupyterhub to work with slurm on my cluster forever, and this fixed it for me. Thank you! 😄

[mbmilligan]

#247 was merged which addresses the same issue, so closing this PR. Thank you for the contribution though!