Fix clippy lints from 1.83 beta

[luizirber]

As detected in nightly CI builds: https://github.com/sourmash-bio/sourmash/actions/runs/11375982992/job/31647671463

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #3357 will degrade performances by 19.61%

_{Comparing lirber/1.83_beta_fix (d6f145d) with latest (29b7887)}

Summary

❌ 4 regressions ✅ 17 untouched benchmarks

:warning: _Please fix the performance issues or acknowledge them on CodSpeed._

Benchmarks breakdown

	Benchmark	latest	lirber/1.83_beta_fix	Change
❌	intersection	18.2 µs	20.3 µs	-10.01%
❌	intersection_size	15.4 µs	18.3 µs	-15.64%
❌	large intersection	9.1 ms	10.6 ms	-14.6%
❌	large intersection_size	7.5 ms	9.3 ms	-19.61%

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 86.45%. Comparing base (29b7887) to head (d6f145d). Report is 1 commits behind head on latest.

Files with missing lines	Patch %	Lines
src/core/src/signature.rs	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## latest #3357 +/- ## ========================================== + Coverage 86.44% 86.45% +0.01% ========================================== Files 137 137 Lines 16070 16069 -1 Branches 2211 2211 ========================================== + Hits 13891 13893 +2 + Misses 1872 1869 -3 Partials 307 307 ``` | [Flag](https://app.codecov.io/gh/sourmash-bio/sourmash/pull/3357/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sourmash-bio) | Coverage Δ | | |---|---|---| | [hypothesis-py](https://app.codecov.io/gh/sourmash-bio/sourmash/pull/3357/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sourmash-bio) | `25.47% <ø> (ø)` | | | [python](https://app.codecov.io/gh/sourmash-bio/sourmash/pull/3357/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sourmash-bio) | `92.39% <ø> (ø)` | | | [rust](https://app.codecov.io/gh/sourmash-bio/sourmash/pull/3357/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sourmash-bio) | `62.21% <0.00%> (+0.08%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sourmash-bio#carryforward-flags-in-the-pull-request-comment) to find out more.

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