fix: use upstream pyo3

[somehowchris]

PyO3 0.15.0 was release 9 days ago.

This PR uses the upstream crate from crates.io instead of the git verion. Any need for the git?

Since 0.15.0 broke some typing namespacing this is a neede change for all developers using PyO3 and pythonize which do not like to hack their way to the working code.

Quickly ran the tests, none of them failed

[davidhewitt]

Thanks, this was on my list of things to do after releasing PyO3 but hadn't made it to it yet. I'll merge this and release new pythonize version shortly...

[codecov-commenter]

Codecov Report

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