Bug#969650: transition: pandas 1.0 -> 1.1

[Rebecca N. Palmer]

Package: python3-pandas
Version: 1.0.5+dfsg-3
Severity: wishlist
Control: block -1 by 969648 969649

pandas 1.1.x is currently in experimental.  The upstream description 
suggests this is not supposed to be an API break, but does have new 
warnings.

Packages tested with it (build + autopkgtest):
augur azure-kusto-python caffe changeo cnvkit dask dask.distributed 
debian-astro debian-science drms glueviz hdmf igdiscover influxdb-python 
intake jsonpickle keras lmfit-py matplotlib metaphlan2 metview-python 
mirtop mlpack nanofilt nbsphinx osmnx partd patsy poliastro poretools 
presto psychopy pybel pychopper pycoqc pynwb pyrle pysal 
python-aioinflux python-airr python-altair python-apptools 
python-biom-format python-cobra python-cogent python-cooler 
python-feather-format python-fluids python-geopandas python-geotiepoints 
python-loompy python-nanoget python-nanomath python-ncls 
python-numpy-groupies python-pauvre python-peakutils python-pomegranate 
python-pyani python-pybedtools python-pymeasure python-skbio 
python-streamz python-tablib python-treetime python-ulmo 
python-vega-datasets python-xarray pyxnat q2-cutadapt q2-demux 
q2-metadata q2-quality-filter q2-types q2templates qiime r-bioc-mofa 
rdkit recan ricks-amdgpu-utils scikit-learn seaborn sentineldl skimage 
sklearn-pandas snakemake sorted-nearest sphinx-gallery spyder-kernels 
statsmodels stimfit sunpy topplot tpot tqdm umis yanagiba

*Regressions* with pandas 1.1.x:
dask (#969648) python-skbio (#969649)

Already broken with pandas 1.0.x, but not obviously worse with 1.1.x:
dask.distributed intake matplotlib mlpack nbsphinx osmnx 
python-biom-format python-cogent python-cooler python-nanoget q2-* qiime 
rdkit sklearn-pandas sunpy yanagiba

(Note that 
https://release.debian.org/britney/pseudo-excuses-experimental.html#pandas 
does not require the reference (unstable) test to be up to date: the 
other "regressions" it lists are where the reference was old enough to 
be 0.25.x.)