chore(deps): update rstest requirement from 0.18.1 to 0.19.0

Updates the requirements on [rstest](https://github.com/la10736/rstest) to permit the latest version.
- [Release notes](https://github.com/la10736/rstest/releases)
- [Changelog](https://github.com/la10736/rstest/blob/master/CHANGELOG.md)
- [Commits](la10736/rstest@v0.18.1...v0.19.0)

---
updated-dependencies:
- dependency-name: rstest
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

hugr/Cargo.toml

@@ -55,7 +55,7 @@ strum_macros = "0.26.1"
 
 [dev-dependencies]
 criterion = { version = "0.5.1", features = ["html_reports"] }
-rstest = "0.18.1"
+rstest = "0.19.0"
 webbrowser = "0.8.10"
 urlencoding = "2.1.2"
 cool_asserts = "2.0.3"