i'm not super knowledgeable about how cargo works but i'm getting this error with defmt 0.3.7:
```
error[E0433]: failed to resolve: could not find `defmt` in the list of imported crates
   --> /home/guinea/.cargo/registry/src/index.crates.io-6f17d22bba15001f/embedded-hal-1.0.0/src/i2c.rs:192:41
    |
192 | #[cfg_attr(feature = "defmt-03", derive(defmt::Format))]
    |                                         ^^^^^^^^^^^^^ could not find `defmt` in the list of imported crates
    |
    = note: this error originates in the derive macro `defmt::Format` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider importing this crate through its public re-export
    |
164 + use crate::defmt;
    |
```