Bump to Pyodide v0.29.3

[agriyakhetarpal]

No description provided.

[joerick]

Error is-

ERROR: Cannot install pyodide-build==0.32.0 because these package versions have conflicting dependencies.

The conflict is caused by:
pyodide-build 0.32.0 depends on virtualenv
The user requested (constraint) virtualenv==20.37.0

Additionally, some packages in these conflicts have no matching distributions available for your environment:
virtualenv

Looks like that virtualenv release was deleted (not yanked), so it's failing there. The fix is in #2734.

[agriyakhetarpal]

Thanks! I bumped them here too, just in case that helps.