Update criterion requirement from 0.3.0 to 0.4.0 (#81)

Updates the requirements on [criterion](https://github.com/bheisler/criterion.rs) to permit the latest version.
- [Release notes](https://github.com/bheisler/criterion.rs/releases)
- [Changelog](https://github.com/bheisler/criterion.rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/bheisler/criterion.rs/compare/0.3.0...0.4.0)

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

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arithmetic/Cargo.toml

@@ -16,7 +16,7 @@ rayon = { version = "1.5.2", default-features = false, optional = true }
 
 [dev-dependencies]
 ark-ec = { version = "^0.3.0", default-features = false }
-criterion = "0.3.0"
+criterion = "0.4.0"
 
 [features]
 # default = [ "parallel", "print-trace" ]