Cut a Release

Create a PR and go through the following steps:

Preparation

Update and check changelog in CHANGES.rst
Bump version in start_jupyter_cm/__init__.py (so that the version in the tag is correct and in the Github tarball.)
(optional) check wheels build. Pushing a tag to a fork will run the release workflow without uploading to pypi

Tag and release ⚠️ this is a point of no return point ⚠️

push tag (vx.y.z) to the upstream repository and the following will be triggered:
- make the packages (wheel and tarball)
- test the package
- upload to pypi
- creation of a Github Release

Post-release action

Increment the version and set it back to dev: vx.y.z.dev0
Prepare CHANGES.rst for development
Merge the PR

Follow-up

Tidy up and close corresponding milestone
A PR to the conda-forge feedstock will be created by the conda-forge bot