Update rstest requirement from 0.18 to 0.20

[dependabot]

Updates the requirements on rstest to permit the latest version.

Release notes

Sourced from rstest's releases.

0.20.0

Introduce #[by_ref] and add support for import rstest with another name.

Changelog

Sourced from rstest's changelog.

[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

Fixed

• Wrong doc test
• Docs

[0.18.0] 2023/7/4

... (truncated)

Commits

• f29e634 Dependency should have a n explicit version to be published
• e27ad2a Removed empty section
• 3867794 Fixed docs
• b90fb8e Fix checkout list
• b161ad6 Make clippy happy
• 0633d46 Update checkout list
• 5112bf7 Bump rstest_reuse version to 0.7.0
• aca3c60 Removed reference on braking changes and outdate documentation about need to ...
• 6cb91f7 Fix typos
• f1146a5 Fix checkout lists
• Additional commits viewable in compare view

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[dependabot]

Superseded by #4.