Update criterion requirement from 0.4.0 to 0.5.1

Updates the requirements on [criterion](/~https://github.com/bheisler/criterion.rs) to permit the latest version.
- [Changelog](/~https://github.com/bheisler/criterion.rs/blob/master/CHANGELOG.md)
- [Commits](bheisler/criterion.rs@0.4.0...0.5.1)

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

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

governor/Cargo.toml

@@ -26,7 +26,7 @@ harness = false
 bench = false
 
 [dev-dependencies]
-criterion = {version = "0.4.0", features = ["html_reports"]}
+criterion = {version = "0.5.1", features = ["html_reports"]}
 tynm = "0.1.4"
 crossbeam = "0.8.0"
 libc = "0.2.70"