chore(deps): update criterion requirement from 0.5 to 0.8 in /eppo_core (#400)

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@0.5.0...criterion-v0.8.1)

---
updated-dependencies:
- dependency-name: criterion
  dependency-version: 0.8.1
  dependency-type: direct:production
...

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eppo_core/Cargo.toml

@@ -64,7 +64,7 @@ wasmtimer = "0.4.1"
 [target.'cfg(all(target_os = "linux", target_arch = "s390x"))'.dependencies]
 
 [dev-dependencies]
-criterion = { version = "0.5", features = ["html_reports"] }
+criterion = { version = "0.8", features = ["html_reports"] }
 tokio = { version = "1.34.0", features = ["test-util"] }
 env_logger = "0.11.3"
 wiremock = "0.6.2"