Update criterion requirement from 0.5.1 to 0.8.1

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@0.5.1...criterion-v0.8.1)

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

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

Author: dependabot[bot]

Cargo.toml

@@ -21,7 +21,7 @@ smptera-format-identifiers-rust = "0.4.0"
 [dev-dependencies]
 assert_matches = "1.5.0"
 bitstream-io = "2.2"
-criterion = "0.5.1"
+criterion = "0.8.1"
 hex-literal = "0.2.1"
 hex-slice = "0.1.4"
 env_logger = "0.11.2"