Ibis: update deprecated call to order_by

[maximlt]

This PR takes care of this warning:

holoviews/tests/core/data/test_ibisinterface.py: 16 warnings
  /Users/mliquet/miniconda3/envs/hv39/lib/python3.9/site-packages/ibis/expr/types/relations.py:1268: FutureWarning: `table.order_by((key, True)) and table.order_by((key, False)) syntax` is deprecated as of v6.0, removed in v7.0; Use ibis.desc(key) or ibis.asc(key) instead

[codecov-commenter]

Codecov Report

Merging #5878 (1834387) into main (9d74f7e) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #5878   +/-   ##
=======================================
  Coverage   88.35%   88.35%           
=======================================
  Files         310      310           
  Lines       63983    63985    +2     
=======================================
+ Hits        56529    56531    +2     
  Misses       7454     7454           

Flag	Coverage Δ
ui-tests	23.41% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
holoviews/core/data/ibis.py	77.01% <100.00%> (+0.14%)	⬆️

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[hoxbro]

I have also removed it in #5854. But I haven't gotten around to finishing up that PR 🙁

[maximlt]

Oh yes I missed that!

[github-actions]

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