Fix binary serialization from JS -> Pyodide

[philippjfr]

Recent versions of Bokeh made two changes that are causing issues for the pyodide bi-directional syncing:

1. JS -> Python communication can now include binary buffers
2. JS events no longer include a setter causing events to boomerang

This PR handles both issues by:

• Adding a converter for the binary data in the FFI layer of JS -> Python conversion

• Setting a locking variable that prevents events from boomeranging while the serialization is in process

• Fixes Update Pyscript version #6080

[codecov]

Codecov Report

Attention: Patch coverage is 10.76923% with 58 lines in your changes are missing coverage. Please review.

Project coverage is 71.38%. Comparing base (5578f98) to head (37ccc10).
Report is 1183 commits behind head on main.

Files	Patch %	Lines
panel/io/pyodide.py	0.00%	42 Missing ⚠️
panel/io/convert.py	27.27%	16 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #6490       +/-   ##
===========================================
- Coverage   82.75%   71.38%   -11.37%     
===========================================
  Files         239      314       +75     
  Lines       34507    46351    +11844     
===========================================
+ Hits        28555    33088     +4533     
- Misses       5952    13263     +7311     

Flag	Coverage Δ
ui-tests	?
unitexamples-tests	71.38% <10.76%> (-2.47%)	⬇️

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