tidy up some lifetimes

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 90.90909% with 2 lines in your changes missing coverage. Please review.

Project coverage is 83.40%. Comparing base (d7f54f1) to head (d5ab23f).

Files	Patch %	Lines
src/de.rs	90.90%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #70 +/- ## ========================================== - Coverage 83.41% 83.40% -0.02% ========================================== Files 3 3 Lines 1224 1217 -7 Branches 1224 1217 -7 ========================================== - Hits 1021 1015 -6 + Misses 144 143 -1 Partials 59 59 ```

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