Fix recursive updates on reactive panes

[philippjfr]

Fixes #4944

[codecov]

Codecov Report

Merging #4946 (93f47dc) into main (bfe5aee) will increase coverage by 0.03%.
The diff coverage is 94.44%.

@@            Coverage Diff             @@
##             main    #4946      +/-   ##
==========================================
+ Coverage   83.43%   83.47%   +0.03%     
==========================================
  Files         270      270              
  Lines       38218    38228      +10     
==========================================
+ Hits        31888    31910      +22     
+ Misses       6330     6318      -12     

Flag	Coverage Δ
ui-tests	40.86% <11.11%> (-0.03%)	⬇️
unitexamples-tests	73.43% <94.44%> (+0.05%)	⬆️

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Impacted Files	Coverage Δ
panel/pane/base.py	87.09% <83.33%> (+4.30%)	⬆️
panel/tests/test_param.py	99.70% <100.00%> (+<0.01%)	⬆️

... and 3 files with indirect coverage changes

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