PR checks won't be triggered on PRs created by Actions workflows.
Therefore mark PRs created by workflows as draft to prompt maintainers
to take the PR out of draft, thereby triggering PR checks.
The changelog for an empty version will now be:
```
No user facing changes.
```
And this will appear in the final changelog when there is an actual release.
The benefits are that users will see regular release cycles and know
how old versions are even if there's no changes for a particular version
If we find that we are going months without any user facing changes, but
we have non-visible changes, then we can rethink this strategy.
But I think this is nicer than having empty sections for a version.
This commit ensures that the changelog is updated before a release with
the correct date and version.
Also, after a release, a mergeback PR is created to ensure that the
changelog update and version bump is available in main.
