build(deps): update rstest requirement from 0.16.0 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@0.16.0...v0.19.0)

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

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

Author: dependabot[bot]

Cargo.toml

@@ -32,7 +32,7 @@ log = { version = "0.4.17", optional = true }
 no_std_io = { version = "0.5.0", default-features = false, features = ["alloc"] }
 
 [dev-dependencies]
-rstest = "0.16.0"
+rstest = "0.19.0"
 hexlit = "0.5.5"
 criterion = "0.4.0"
 alloc_counter = "0.0.4"

deku-derive/Cargo.toml

@@ -26,4 +26,4 @@ darling = "0.14"
 proc-macro-crate = { version = "1.3.0", optional = true }
 
 [dev-dependencies]
-rstest = "0.16"
+rstest = "0.19"