Update master after release 4.3.1

[stoerr]

Update master after new release

[stoerr]

@ist-rw Strangely, I cannot advance the master branch: the release job failed at that stage for an unknown reason and I cannot push to the master branch anymore, for an to me equally unknown reason. And merging this PR is not allowed, too. 8-} Can you please do that? Did you change anything there? Thanks!

For the record:
https://github.com/ist-dresden/composum-nodes/actions/runs/7915419390/job/21607217551 said:
hint: Updates were rejected because the remote contains work that you do not
hint: have locally. This is usually caused by another repository pushing to
hint: the same ref. If you want to integrate the remote changes, use
hint: 'git pull' before pushing again.

That doesn't make much sense to me at the moment. Master was contained in develop.