Migrate to embedded-hal 1.0.0-alpha9

[peckpeck]

I had to add non blocking hal for serial and migrate IoPin members to their structures since the trait has disappeared.

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @posborne (or someone else) soon.

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[peckpeck]

Added a fixup for fmt

[bors[bot]]

Build succeeded:

• CI (1.54.0, x86_64-unknown-linux-gnu)
• CI (stable, armv7-unknown-linux-gnueabihf)
• CI (stable, x86_64-unknown-linux-gnu)