chore(deps): update rust crate rstest to 0.18

[stackable-bot]

This PR contains the following updates:

Package	Type	Update	Change
rstest	dev-dependencies	minor	0.17 -> 0.18

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Release Notes

la10736/rstest (rstest)

v0.18.1

Compare Source

Fixed

• Wrong doc test
• Docs

v0.18.0

Compare Source

Add

• Add support for RSTEST_TIMEOUT environment variable to define a max timeout
  for each function (see #​190 for details).
  Thanks to @​aviramha for idea and PR
• #[files("glob path")] attribute to generate tests based on files that
  satisfy the given glob path (see #​163 for details).

Changed

• Switch to syn 2.0 and edition 2021 : minimal Rust version now is 1.56.0
  both for rstest and rstest_reuse (see #​187)

Fixed

• Fixed wired behavior on extraction #[awt] function attrs (See
  #​189)

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[stackable-bot]

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