maturin
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update to cargo-xwin 0.19
cargo-xwin 0.18 does not work after cargo-update due to rust-cross/cargo-xwin#160
This also does a cargo update, which picks up ring 0.17.14, which lets maturin work on Amazon Linux 2 with --locked
Fixes #2659
This requires a quite big MSRV update + dealing with the CDCL license issue if you want
Following up on this