Update dependency jupyterhub/configurable-http-proxy to v4.5.3

This MR contains the following updates:

Package	Type	Update	Change
jupyterhub/configurable-http-proxy	ironbank-docker	patch	4.5.2 -> 4.5.3
jupyterhub/configurable-http-proxy		patch	4.5.2 -> 4.5.3
jupyterhub/configurable-http-proxy	stage	patch	4.5.2 -> 4.5.3

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Release Notes

jupyterhub/configurable-http-proxy

v4.5.3

Compare Source

(full changelog)

Dependency updates

• build(deps): bump prom-client from 14.0.1 to 14.1.0 #​428 (@​dependabot)

Continuous integration improvements

• ci: add dependabot bumping of github actions #​418 (@​consideRatio)

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