Fix dask git revision

[rchomjak]

In the latest regression GHA run (https://github.com/duckdblabs/db-benchmark/actions/runs/20071054264/job/57645755510)

There is an dask error:

locket, fsspec, cloudpickle, click, python-dateutil, partd, jinja2, importlib_metadata, contourpy, pandas, dask, distributed, bokeh
2025-12-10T09:20:46.2833335Z 
2025-12-10T09:20:46.2893021Z Successfully installed MarkupSafe-3.0.3 bokeh-3.8.1 click-8.3.1 cloudpickle-3.1.2 contourpy-1.3.2 dask-2025.11.0 distributed-2025.11.0 fsspec-2025.12.0 importlib_metadata-8.7.0 jinja2-3.1.6 locket-1.0.0 lz4-4.4.5 msgpack-1.1.2 narwhals-2.13.0 numpy-2.2.6 packaging-25.0 pandas-2.3.3 partd-1.4.2 pillow-12.0.0 psutil-7.1.3 pyarrow-22.0.0 python-dateutil-2.9.0.post0 pytz-2025.2 pyyaml-6.0.3 six-1.17.0 sortedcontainers-2.4.0 tblib-3.2.2 toolz-1.1.0 tornado-6.5.2 tzdata-2025.2 urllib3-2.6.1 xyzservices-2025.11.0 zict-3.0.0 zipp-3.23.0
2025-12-10T09:20:46.9295492Z Traceback (most recent call last):
2025-12-10T09:20:46.9305351Z   File "<string>", line 1, in <module>
2025-12-10T09:20:46.9305812Z TypeError: write() argument must be str, not None
2025-12-10T09:20:46.9503045Z Installing dask

I removed the git_version because it is None.

Here is the demonstration of fix

[rchomjak]

@Tmonster not sure if it is needed, wasn't able to find the issue for it.

[Tmonster]

@rchomjak it might be, I saw dask failing on your other PR, but dask can be a sensitive setup process I've noticed

[rchomjak]

@Tmonster dask passed, but the runner had a problem System.IO.IOException: No space left on device : '/home/runner/actions-runner/cached/_diag/Worker_20260102-222302-utc.log'

[rchomjak]

@Tmonster Let me know if anything else is needed to do.