Update jupyterhub/configurable-http-proxy Docker tag to v4.4.0 - autoclosed

This MR contains the following updates:

Package	Type	Update	Change
jupyterhub/configurable-http-proxy		minor	4.3.2 -> 4.4.0
jupyterhub/configurable-http-proxy	stage	minor	4.3.2 -> 4.4.0

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