chore(deps): update rust crate rstest to 0.20.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rstest	dev-dependencies	minor	0.19.0 -> 0.20.0

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Release Notes

la10736/rstest (rstest)

v0.20.0

Compare Source

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

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