chore(deps): update rust crate rstest to 0.21.0 (#70)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [rstest](https://togithub.com/la10736/rstest) | dev-dependencies |
minor | `0.19.0` -> `0.21.0` |

---

### Release Notes

<details>
<summary>la10736/rstest (rstest)</summary>

###
[`v0.21.0`](https://togithub.com/la10736/rstest/blob/HEAD/CHANGELOG.md#0210-202461)

[Compare
Source](https://togithub.com/la10736/rstest/compare/v0.20.0...v0.21.0)

##### Changed

-   Add feature `crate-name` enabled by default to opt-in crate rename
support. See
[#&#8203;258](https://togithub.com/la10736/rstest/issues/258)

###
[`v0.20.0`](https://togithub.com/la10736/rstest/blob/HEAD/CHANGELOG.md#0200-2024530)

[Compare
Source](https://togithub.com/la10736/rstest/compare/v0.19.0...v0.20.0)

##### Add

- Implemented `#[by_ref]` attribute to take get a local lifetime for
test arguments.
See [#&#8203;241](https://togithub.com/la10736/rstest/issues/241) for
more details. Thanks to
[@&#8203;narpfel](https://togithub.com/narpfel) for suggesting it and
useful discussions.
- Support for import `rstest` with another name. See
[#&#8203;221](https://togithub.com/la10736/rstest/issues/221)

##### Fixed

- Don't remove Lifetimes from test function if any. See
[#&#8203;230](https://togithub.com/la10736/rstest/issues/230)
[#&#8203;241](https://togithub.com/la10736/rstest/issues/241) for more
details.
- [`PathBuf`](https://doc.rust-lang.org/std/path/struct.PathBuf.html)
does no longer need to be
in scope when using `#[files]` (see
[#&#8203;242](https://togithub.com/la10736/rstest/pull/242))
- `#[from(now::accept::also::path::for::fixture)]` See
[#&#8203;246](https://togithub.com/la10736/rstest/issues/246)
    for more details

</details>

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Cargo.toml

@@ -10,7 +10,7 @@ license = "MIT"
 winnow = "0.6.7"
 
 [dev-dependencies]
-rstest = "0.19.0"
+rstest = "0.21.0"
 insta = { version = "1.38.0", features = ["yaml"] }
 serde = "1.0.199"
 itertools = "0.12.1"