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] <[email protected]>

gotham-server/Cargo.toml

@@ -43,7 +43,7 @@ default-features = false
 [dev-dependencies]
 time-test = "0.2.1"
 floating-duration.workspace = true
-criterion = "0.4.0"
+criterion = "0.5.1"
 pprof = { version = "0.11", features = ["flamegraph", "frame-pointer", "criterion"] }
 
 [[bench]]