Update jupyterhub/configurable-http-proxy Docker tag to v4.5.4

This MR contains the following updates:

Package	Type	Update	Change
jupyterhub/configurable-http-proxy	ironbank-docker	patch	4.5.3 -> 4.5.4
jupyterhub/configurable-http-proxy		patch	4.5.3 -> 4.5.4
jupyterhub/configurable-http-proxy	stage	patch	4.5.3 -> 4.5.4

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Release Notes

jupyterhub/configurable-http-proxy

v4.5.4

Compare Source

(full changelog)

Dependency updates

• build(deps): bump winston from 3.8.1 to 3.8.2 #​432 (@​dependabot)

Continuous integration

• ci: small updates to workflows, updating misc versions #​439 (@​consideRatio)
• build(deps): bump docker/build-push-action from 3.1.1 to 3.2.0 #​437 (@​dependabot)
• build(deps): bump docker/setup-buildx-action from 2.0.0 to 2.1.0 #​436 (@​dependabot)
• build(deps): bump docker/setup-qemu-action from 2.0.0 to 2.1.0 #​435 (@​dependabot)

Contributors to this release

(GitHub contributors page for this release)

@​consideRatio | @​yuvipanda

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