Update rstest requirement from 0.18 to 0.21

[dependabot]

Updates the requirements on rstest to permit the latest version.

Release notes

Sourced from rstest's releases.

0.21.0

Use crate-name feature to enable the crate rename support (enabled by default)

Changelog

Sourced from rstest's changelog.

[0.21.0] 2024/6/1

Changed

• Add feature crate-name enabled by default to opt-in crate rename support. See #258

[0.20.0] 2024/5/30

Add

• Implemented #[by_ref] attribute to take get a local lifetime for test arguments. See #241 for more details. Thanks to @​narpfel for suggesting it and useful discussions.
• Support for import rstest with another name. See #221

Fixed

• Don't remove Lifetimes from test function if any. See #230 #241 for more details.
• PathBuf does no longer need to be in scope when using #[files] (see #242)
• #[from(now::accept::also::path::for::fixture)] See #246 for more details

[0.19.0] 2024/4/9

Changed

• Defined rust-version for each crate (see #227)

Fixed

• #[once] fixtures now require the returned type to be Sync to prevent UB when tests are executed in parallel. (see #235 for more details)

• #[future(awt)] and #[awt] now properly handle mutable (mut) parameters by treating futures as immutable and treating the awaited rebinding as mutable.

[0.18.2] 2023/8/13

Changed

• Now #[files] accept also parent folders (see #205 for more details).

[0.18.1] 2023/7/5

... (truncated)

Commits

• 38da6bf Prepare 0.21.0 Release
• ca69788 bump version rstest_test to 0.13.0
• b6b43c6 Clean chackoutlist
• fef4f7b Implemented Opt-in crate-name support Fix #258
• 236be92 Build should use build tests target
• 8fde5be Prepare next changelog
• f29e634 Dependency should have a n explicit version to be published
• e27ad2a Removed empty section
• 3867794 Fixed docs
• b90fb8e Fix checkout list
• Additional commits viewable in compare view

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