Fix the playground

[DanielNoord]

This ensure the playground will install the latest version from pypi and updates the version of pyodide used.
Loads relatively fast on my laptop.

By in-lining we ensure this also works locally and in build rather than always referring to whatever is live on the documentation site.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.16%. Comparing base (9d19240) to head (dfbda3f).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2494   +/-   ##
=======================================
  Coverage   99.16%   99.16%           
=======================================
  Files          40       40           
  Lines        3096     3096           
  Branches      674      674           
=======================================
  Hits         3070     3070           
  Misses         14       14           
  Partials       12       12           

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