Several fixes

[PrimozGodec]

This PR solves several issues in the addon:

• Addon now support Pandas version >=1.1
• SC Datasets is updated to a newer version of the Orange Dataset widget
• Updated deprecated len(domain) in filter
• _upate_summary function is now function in the orangewidget.sinals which interfered with _upate_summary in Filter widget. Function in Filter widget is temporarily renamed. This functionality could be later changed or removed when default summaries will be available by Orange.

[codecov-commenter]

Codecov Report

Merging #384 (1c59378) into master (3d0df2e) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #384   +/-   ##
=======================================
  Coverage   80.49%   80.49%           
=======================================
  Files          21       21           
  Lines        5449     5450    +1     
=======================================
+ Hits         4386     4387    +1     
  Misses       1063     1063           

Impacted Files	Coverage Δ
orangecontrib/single_cell/widgets/owscdatasets.py	47.94% <ø> (ø)
orangecontrib/single_cell/widgets/load_data.py	92.85% <100.00%> (+0.01%)	:arrow_up:
orangecontrib/single_cell/widgets/owfilter.py	80.69% <100.00%> (ø)
orangecontrib/single_cell/widgets/owloaddata.py	83.77% <100.00%> (ø)

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