chore(deps): update rstest requirement from 0.19.0 to 0.20.0

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@v0.19.0...v0.19.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.toml

@@ -101,7 +101,7 @@ object_store = { version = "0.9.1", default-features = false }
 parking_lot = "0.12"
 parquet = { version = "51.0.0", default-features = false, features = ["arrow", "async", "object_store"] }
 rand = "0.8"
-rstest = "0.19.0"
+rstest = "0.20.0"
 serde_json = "1"
 sqlparser = { version = "0.45.0", features = ["visitor"] }
 tempfile = "3"