Use the `zip32::Scope` type

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (c5dea4e) 80.64% compared to head (a55fbf1) 80.64%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #415 +/- ## ======================================= Coverage 80.64% 80.64% ======================================= Files 30 30 Lines 3152 3152 ======================================= Hits 2542 2542 Misses 610 610 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.