Update dependency jupyterhub_kubespawner to v4

This MR contains the following updates:

Package	Type	Update	Change
jupyterhub_kubespawner	ironbank-pypi	major	0.16.1 -> 4.2.0

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Release Notes

jupyterhub/kubespawner

v4.2.0

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v4.1.0

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v4.0.0

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v3.0.2

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v3.0.1

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v3.0.0

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v2.0.1

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v2.0.0

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v1.1.2

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v1.1.1

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v1.1.0

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v1.0.0

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Configuration

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♻ Rebasing: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this MR and you won't be reminded about this update again.

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This MR has been generated by Renovate Bot.