Update criterion requirement from 0.7 to 0.8 (#698)

Updates the requirements on [criterion](https://github.com/criterion-rs/criterion.rs) to permit the latest version.
- [Release notes](https://github.com/criterion-rs/criterion.rs/releases)
- [Changelog](https://github.com/criterion-rs/criterion.rs/blob/master/CHANGELOG.md)
- [Commits](criterion-rs/criterion.rs@criterion-plot-v0.7.0...criterion-v0.8.0)

---
updated-dependencies:
- dependency-name: criterion
  dependency-version: 0.8.0
  dependency-type: direct:production
...

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Cargo.toml

@@ -37,7 +37,7 @@ string_cache_codegen = "0.6.1"
 utf-8 = "0.7"
 
 # Dev dependencies
-criterion = "0.7"
+criterion = "0.8"
 env_logger = "0.10"
 libtest-mimic = "0.8.1"
 rand = "0.9"