Upstream CI failing silently

[mathause]

The last 5 days our Upstream CI failed silently with a timeout after 6h:

https://github.com/pydata/xarray/actions/workflows/upstream-dev-ci.yaml?query=branch%3Amaster+event%3Aschedule

This was probably caused by #4934. As mentioned in dask/dask#4934 this is probably dask/dask#6738 which was merged 5 days ago.

[mathause]

Ok #4946 worked - we got an automatic issue again. Closing.