Handle parameter references from Param 2.0

[philippjfr]

Avoids various warnings when working with Param 2.0

[codecov-commenter]

Codecov Report

Merging #5906 (bbc47d4) into main (79008ed) will decrease coverage by 0.02%.
The diff coverage is 76.19%.

@@            Coverage Diff             @@
##             main    #5906      +/-   ##
==========================================
- Coverage   88.41%   88.39%   -0.02%     
==========================================
  Files         312      312              
  Lines       64953    64967      +14     
==========================================
+ Hits        57427    57429       +2     
- Misses       7526     7538      +12     

Flag	Coverage Δ
ui-tests	23.32% <4.76%> (-0.01%)	⬇️

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Files Changed	Coverage Δ
holoviews/util/__init__.py	73.97% <ø> (ø)
holoviews/streams.py	86.91% <63.63%> (-0.35%)	⬇️
holoviews/core/util.py	85.55% <75.00%> (-0.53%)	⬇️
holoviews/core/spaces.py	84.62% <100.00%> (-0.05%)	⬇️
holoviews/tests/util/test_transform.py	95.75% <100.00%> (ø)

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