polars version upgrade

[yusufuyanik1]

No description provided.

[StijnKas]

Let's be a bit more flexible: it's i think it works from polars>=0.19.0, <=0.19.5

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (7a81035) 66.03% compared to head (9bfd477) 66.32%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #125      +/-   ##
==========================================
+ Coverage   66.03%   66.32%   +0.28%     
==========================================
  Files          20       20              
  Lines        2806     2806              
==========================================
+ Hits         1853     1861       +8     
+ Misses        953      945       -8     

Files	Coverage Δ
python/pdstools/adm/ADMDatamart.py	74.23% <100.00%> (ø)
python/pdstools/adm/ADMTrees.py	80.96% <100.00%> (ø)
python/pdstools/plots/plots_plotly.py	82.75% <ø> (ø)
python/pdstools/utils/cdh_utils.py	86.15% <ø> (ø)
python/pdstools/utils/streamlit_utils.py	0.00% <ø> (ø)
python/pdstools/valuefinder/ValueFinder.py	92.42% <100.00%> (ø)
python/pdstools/adm/Tables.py	56.36% <0.00%> (ø)
python/pdstools/plots/plot_base.py	71.91% <60.00%> (ø)

... and 2 files with indirect coverage changes

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