Fix Path.datatype parameter type

[maximlt]

From ObjectSelector to List, List being the type of datatype in the base class Dataset.

[Hoxbro]

Looks good. I have enabled auto-merge for this PR. If you are not finished with please disable it 👍

[codecov-commenter]

Codecov Report

Merging #5897 (d17d38d) into main (70e7d5a) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #5897   +/-   ##
=======================================
  Coverage   88.40%   88.40%           
=======================================
  Files         312      312           
  Lines       64943    64943           
=======================================
+ Hits        57411    57412    +1     
+ Misses       7532     7531    -1     

Flag	Coverage Δ
ui-tests	23.33% <100.00%> (ø)

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

Files Changed	Coverage Δ
holoviews/element/path.py	86.87% <100.00%> (ø)

... and 1 file with indirect coverage changes

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