Investigate more Pyodide 0.28 / micropip changes

[jtpio]

Had a look through everything:

• it's possible to get some setTime errors when doing things fast
  • maybe happens on 0.6.3
• --force-reinstall "works" (it updated the files on disk)
  • but then importlib.reload doesn't work
  • so maybe instead we pull the feature?

Originally posted by @bollwyvl in https://github.com/jupyterlite/pyodide-kernel/issues/204#issuecomment-3161793147