Update to defmt 1.0.1, embedded-hal-bus 0.3.0, env_logger 0.11.8, heapless 0.9.1, and hex-literal 1.0.0.

[ColinFinck]

The upgrade from heapless 0.8.x to 0.9.x is particularly important for me, because I'm heavily using heapless in an embedded software project and need to use a single consistent version for interoperability. I took this opportunity to upgrade all other outdated dependencies too.

This raises the MSRV to 1.86.0. Testing has shown that this is the minimum required version for heapless 0.9.1.

CC @thejpster

[thejpster]

Ah, GitHub - you suck. Why can’t it work out that the jobs I told it should pass no longer exist in the repo? Why isn’t the pass/fail config in the repo where I could change it rather than living in the database where there is now a race hazard?

I will merge this when I get back to my laptop (I’m at Oxidize) and fix the required jobs setting.

[thejpster]

Thank you for your PR.

[rursprung]

Ah, GitHub - you suck. Why can’t it work out that the jobs I told it should pass no longer exist in the repo? Why isn’t the pass/fail config in the repo where I could change it rather than living in the database where there is now a race hazard?

that's why i started using a single build-results job in all my workflows: https://github.com/rust-embedded-community/tb6612fng-rs/blob/master/.github/workflows/CI.yml#L98-L112
then you just depend on that and can change everything in the file.

[thejpster]

Yes, cortex-ar and the ferrous trainings do something similar. I just haven't updated this one yet.