chore(deps): Update Rust crate divan to v0.1.21 (#94)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [divan](https://redirect.github.com/nvzqz/divan) | dev-dependencies |
patch | `0.1.17` -> `0.1.21` |

---

### Release Notes

<details>
<summary>nvzqz/divan (divan)</summary>

###
[`v0.1.21`](https://redirect.github.com/nvzqz/divan/blob/HEAD/CHANGELOG.md#0121---2025-04-09)

[Compare
Source](https://redirect.github.com/nvzqz/divan/compare/v0.1.20...v0.1.21)

##### Fixed

-   `Divan::skip_exact` behaved incorrectly in `v0.1.19`.

##### Changed

- Improved handling of internal code around filters and those
responsible for
    sacking the people who have just been sacked have been sacked.

###
[`v0.1.20`](https://redirect.github.com/nvzqz/divan/blob/HEAD/CHANGELOG.md#0120---2025-04-09)

[Compare
Source](https://redirect.github.com/nvzqz/divan/compare/v0.1.19...v0.1.20)

##### Fixed

-   `Divan::skip_regex` accidentally dropped

[`regex_lite::Regex`](https://docs.rs/regex-lite/latest/regex_lite/struct.Regex.html)
    and behaved incorrectly in `v0.1.19`.

###
[`v0.1.19`](https://redirect.github.com/nvzqz/divan/blob/HEAD/CHANGELOG.md#0119---2025-04-09)

[Compare
Source](https://redirect.github.com/nvzqz/divan/compare/v0.1.18...v0.1.19)

##### Fixed

- \[`cargo-nextest`] no longer skips benchmarks with argument parameters
(\[[#&#8203;75](https://redirect.github.com/nvzqz/divan/issues/75)]).

##### Changed

-   Organized positive and negative filters into a split buffer.

###
[`v0.1.18`](https://redirect.github.com/nvzqz/divan/blob/HEAD/CHANGELOG.md#0118---2025-04-05)

[Compare
Source](https://redirect.github.com/nvzqz/divan/compare/v0.1.17...v0.1.18)

##### Added

-   Support for \[`cargo-nextest`] running benchmarks as tests.

- \[`prelude`] module for simplifying imports of
\[`#[bench]`]\[bench_attr],
\[`#[bench_group]`]\[bench_group_attr], \[`black_box`],
\[`black_box_drop`],
    \[`AllocProfiler`], \[`Bencher`], and \[`Divan`].

-   Support `wasi` and `emscripten` targets.

</details>

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