Drop requirement for NdMapping to be defined with OrderedDict

[philippjfr]

Since Python dict is now ordered the limitation around requiring an NdMapping input dict to be an OrderedDict is no longer necessary.

[Hoxbro]

Can you also remove?

holoviews/holoviews/element/tabular.py

Lines 44 to 46 in 04d7fa6

	if type(data) == dict:
	raise ValueError("ItemTable cannot accept a standard Python dictionary "
	"as a well-defined item ordering is required.")

[codecov-commenter]

Codecov Report

Merging #5867 (2d4a7d8) into main (04d7fa6) will increase coverage by 0.13%.
Report is 1 commits behind head on main.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main    #5867      +/-   ##
==========================================
+ Coverage   88.23%   88.36%   +0.13%     
==========================================
  Files         310      310              
  Lines       63962    63959       -3     
==========================================
+ Hits        56434    56517      +83     
+ Misses       7528     7442      -86     

Flag	Coverage Δ
ui-tests	23.40% <0.00%> (?)

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

Files Changed	Coverage Δ
holoviews/core/ndmapping.py	80.03% <ø> (+0.11%)	⬆️
holoviews/element/tabular.py	50.79% <50.00%> (-0.77%)	⬇️

... and 3 files with indirect coverage changes

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