build(deps): bump jupyter-server-proxy from 4.1.2 to 4.2.0 in /docker…

…/py (#450)

Bumps [jupyter-server-proxy](https://github.com/jupyterhub/jupyter-server-proxy) from 4.1.2 to 4.2.0.
- [Release notes](https://github.com/jupyterhub/jupyter-server-proxy/releases)
- [Changelog](https://github.com/jupyterhub/jupyter-server-proxy/blob/main/RELEASE.md)
- [Commits](jupyterhub/jupyter-server-proxy@v4.1.2...v4.2.0)

---
updated-dependencies:
- dependency-name: jupyter-server-proxy
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

docker/py/requirements.txt

@@ -1,7 +1,7 @@
 bleach>5.0.0 # closes #300
 certifi>=2022.12.7 # not directly required, pinned by Snyk to avoid a vulnerability
 Jinja2<3.1 # because of https://github.com/jupyter/nbconvert/issues/1742
-jupyter-server-proxy==4.1.2
+jupyter-server-proxy==4.2.0
 jupyterlab-git==0.50.1
 jupyterlab-system-monitor~=0.8.0
 mistune>=2.0.1 # not directly required, pinned by Snyk to avoid a vulnerability