[8 hours of time] [Deadline 23th Oct] Erik doing good community citizen work

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This is the third issue of its kind, where the previous was #4884.

Definition of done

• I put in 8h of work in the jupyterhub ecosystem purely nagivated by my JupyterHub team member hat on
• I provide an overview of work that was done in this issue before closing

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• 5h on friday: z2jh 4 release focused work. I for example tested z2jh 4.0.0-beta.4 in 2i2c infra and followed up with some fixes detected for jupyterhub, and did some convenience things for people to upgrade in kubespawner, and prepared ldapauthenticator 2's release
  • Testing upgrade from jupyterhub 3.3.7 to 4.0.0-beta.4 #4979
  • Exiting applicaiton log message to be done at a higher log level than debug jupyterhub/jupyterhub#4928
  • JupyterHub startup aborted by failure to connect to an external service (behavior change between jh 4.1.5 and 5.0.0-5.2.0) jupyterhub/jupyterhub#4929
  • Abort jupyterhub startup only if managed services fail jupyterhub/jupyterhub#4930
  • Add escape_slug as a utility function alongside safe_slug jupyterhub/kubespawner#865
  • Add changelog for 2.0.0 jupyterhub/ldapauthenticator#288
• 1.5h on monday: maintenance of jupyter-rsession-proxy as prompted by issue triaging in tljh, and cut the tljh 2.0.0 release after a beta.1 has been out a while without issues.
  • Add and document release automation via github actions jupyterhub/jupyter-rsession-proxy#155
  • Retroactively add v2.2.1 to changelog and fix heading levels etc jupyterhub/jupyter-rsession-proxy#154
  • A set of small updates, including default to use string normalization for new projects jupyterhub/jupyterhub-python-repo-template#31
  • Release planning for v2 jupyterhub/the-littlest-jupyterhub#991
• 0.5h on monday: jupyterhub 5.2.1 and kubespawner 7.0.0 release stuff
  • changelog for 5.2.1 jupyterhub/jupyterhub#4935
  • Add changelog for 7.0.0 jupyterhub/kubespawner#866