Dask: Downgrade to pandas 2

pandas 3 was released on Jan 21, apparently it breaks the workflow.

Author: amotl

by-dataframe/dask/requirements.txt

@@ -2,5 +2,6 @@ click<9
 colorlog<7
 dask[dataframe]>=2024.4.1   # Python 3.11.9 breaks previous Dask
 distributed>=2024.4.1       # Python 3.11.9 breaks previous Dask
+pandas<3
 pueblo>=0.0.10
 sqlalchemy-cratedb>=0.41.0.dev2