Suppress rustc suggestion to manually implement traits

Introduced in a recent nightly:

https://github.com/google/zerocopy/pull/3070/changes#diff-e231da8fd95a193bd0a26b2eb1f3428d509b145c8de64bb936e1e339986350f6R27-R28

```
   = help: consider manually implementing `zerocopy_renamed::TryFromBytes` to avoid undesired bounds
```