Upgrade to `pyscript` w/ `pyodide>=0.27.0` support

[dangotbanned]

Serving as a tracking issue for now.
Only pyodide@0.26.4 is supported so far in pyscript@2024.11.1, and pyscript@2025.2.1

Tracking

• Update to pyodide>=0.27.0 pyscript/pyscript#2281

Related

• docs: Adds Vega-Altair Theme Test #3630 (comment)
  • 5.5.0 Release Planning #3687 (reply in thread)
  • https://altair-viz.github.io/user_guide/customization.html#built-in-themes
• Update version Altair on pyodide #3642
  • Update altair to 5.4.1 pyodide/pyodide#5124
  • https://pyodide.org/en/stable/project/changelog.html#packages
• https://github.com/pyscript/pyscript/releases
  • Updated to latest Pyodide + cleaner Polyscript pyscript/pyscript#2256